the key points to learn Flashcards

(218 cards)

1
Q

components of consent

A
capacity
informed
voluntary
not coerced
not manipulated
valid
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2
Q

valid consent components

A

current
specific
in date

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3
Q

capacity

A
to act
reasoned decision
communicate decision
understand decision
retain memory
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4
Q

clinical negligence

A
duty of care
duty was breached
caused/materially contributed to damage
damage was reasonably foreseeable and had negative consequences and effects
= on balance of probability
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5
Q

how long can you sue for?

A

3yrs to sue - from moment you first knew something was wrong

- children until 21

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6
Q

how long should you keep records for?

A

min 11yrs

children until 25

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7
Q

epidemiology

A

study of pops to determine the freq and distribution of disease

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8
Q

roles of epidemiology

A
monitor infectious diseases
monitor non-infectious diseases
study NH of diseases
investigate RFs of diseases
health needs assessment
development of preventive programmes
evaluation of interventions
health service planning
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9
Q

incidence

A

number of new individuals who contract a disease during a particular period of time

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10
Q

where are incidence estimates obtained from?

A

longitudinal studies/derived from registers

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11
Q

limitations of DMF

A

teeth ext for reasons other than caries
influenced by access e.g. IP surface
diff in differentiating FS from Rxs - underestimate caries
influenced by past disease activity
threshold criteria of disease can vary (must specify)
cannot be used for root caries

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12
Q

types of epidemiological study

A

descriptive (observational)
analytic (observational)
intervention/experimental

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13
Q

descriptive (observational) study

A

measures of disease freq - incidence, prevalence

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14
Q

analytic (observational) study

A

case control

cohort

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15
Q

intervention/experimental study

A

RCT

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16
Q

prevalence

A

number of existing cases

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17
Q

where are prevalence estimates obtained from?

A

CS studies/derived from registers

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18
Q

advantages of sampling

A

reduced number of individuals to be sampled
reduced cost
higher response rate
higher quality of info collected

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19
Q

types of sampling

A
simple random sample
systematic
stratified
cluster
multi-stage
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20
Q

errors in sampling

A
sampling/selection bias
response/info bias
measurement error
observer variation
 - intra - you
 - inter
loss to follow up
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21
Q

public health definition

A

the science and practice of preventing diseases, promoting health and improving QOL through the organised efforts of society

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22
Q

aims of public health

A

tackle inequalities

improve reach of services

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23
Q

dimensions of HC quality

A
person-centred
safe
efficient
equitable
effective
timely
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24
Q

Kerr report

A

inverse care law

reactive (should be anticipatory)

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25
criteria for a public health problem
prevalence of condition impact of condition on individual level impact on wider society e.g. £ condition preventable and effective txs are available
26
main roles of public health
``` epidemiology health needs assessment preventing disease and health improvement addressing health inequalities policy development development and implementation of local health strategies service development - clinical pathways pt safety improving governance systems and QI evaluating health services teaching and training research ```
27
protected characteristics
``` Equality Act 2010 age disability gender gender reassignment pregnancy and maternity marriage and civil partnership religion and belief sexual orientation race/ethnicity ``` reasonable adjustments
28
evidence levels from high to low
``` SRs and meta-analyses RCTs cohort case-control CS ecological studies case series and case reports ideas, editorials and opinions ```
29
design elements of RCTs
inclusion/exclusion criteria comparison/control group randomisation blinding/masking
30
allocation concealment (selection bias)
technique to prevent selection bias by concealing the allocation sequence from those assigning participants to intervention groups, until moment of assignment prevents researchers from influencing which participants are assigned to a given intervention group
31
advantage of RCTs
provide strongest and most direct epidemiologic evidence for causality. Gold standard
32
disadvantages of RCTs
more difficult to design and conduct than observational studies - ethical issues - feasibility - £ still some risk of bias and generalisability often limited not suitable for all research Qs
33
CIs VofND
diff = 0 ratio = 1
34
CIs
quantify level of uncertainty tells us the range of values that a true pop tx effect is likely to lie overlaps/contains VofND - insufficient evidence for a diff
35
odds ratio
intervention odds/control odds
36
relative risk reduction
starting-modified/starting risk x100
37
absolute risk reduction
starting - modified risk
38
NNT
1/ARD | round up
39
ARD
difference in risk between groups
40
risk ratio
risk in tx group/risk in placebo group
41
risk
number of events of interest/total number of observations
42
odds
number of events of interest/number without the event
43
aims
broad goals
44
objectives
specific and define what participants achieve at end of intervention
45
educational objectives
knowledge: increase in level of knowledge affective: change in behaviour/beliefs behaviours: acquisition of new skills/competencies
46
SMART objective
``` Specific Measurable Appropriate Realistic Time-related ```
47
planning framework
``` identify needs and priorities set aims and objectives decide best way to achieve aims identify resources plan evaluation methods set action plan ACTION - implement your plan and evaluation ```
48
what % of budget is often set aside for evaluation?
10-15%
49
3 Es of evaluation
efficiency effectiveness economy
50
3 Es of evaluation - efficiency
assess what has been achieved, did intervention have desired effect
51
3 Es of evaluation - effectiveness
measure impact and whether was worthwhile
52
3 Es of evaluation - economy
cost-effectiveness and whether time/labour and money were well-spent
53
purpose of evaluation
inform future plans | justify decisions to others
54
types of evaluation
impact - immediate effects process outcome - longer-term
55
research methods used in evaluation
``` semi-structured interviews observation focus groups self-response surveys interview-based surveys telephone interviews = use of both qualitative/quantitative useful ```
56
what was the ottawa charter?
1st conference in health promotion
57
aspects of the ottawa charter
``` building healthy public policy creating supportive env strengthening community action developing personal skills re-orientating health services ```
58
concentration for cleaning blood spills
10 000ppm
59
concentration for cleaning other spills
1000ppm
60
consulting styles
directing following guiding
61
domestic abuse response
``` Ask Validate "you don't deserve to be hit" Document Refer - Scottish Domestic Abuse Helpline - Rape Crisis Scotland ```
62
how long should you keep a consignment note for?
3yrs
63
what should the consignment note contain?
description, destination, quantity, origin, transport
64
principles of waste disposal
segregation storage disposal document
65
F supplements for <0.3ppm F ion level in drinking water - <6m
nil
66
F supplements for <0.3ppm F ion level in drinking water - 6m-3yrs
0.25mg
67
F supplements for <0.3ppm F ion level in drinking water - 3-6yrs
0.5mg
68
F supplements for <0.3ppm F ion level in drinking water - 6-16yrs
1mg
69
F supplements for <0.6ppm F ion level in drinking water - <6m
nil
70
F supplements for <0.6ppm F ion level in drinking water - 6m-3yrs
nil
71
F supplements for <0.6ppm F ion level in drinking water - 3-6yrs
0.25mg
72
F supplements for <0.6ppm F ion level in drinking water - 6-16yrs
0.5mg
73
F supplements for >0.6ppm F ion level in drinking water
nil
74
OARS - communicating behaviour change
``` Open Qs - how are you managing...? Affirmation - you've managed to keep up Reflective listening Summary - advice ask permission to discuss health behaviour ```
75
cycle of behaviour change
``` precontemplation contemplation preparation action maintenance = at all stages possible relapse ```
76
VBA
Ask Advise Act "drip effect"
77
Brief 5As
``` Ask Advise Assess Assist Arrange follow-up ```
78
how does F work?
reduces demineralisation makes E more resistant to acid attack increases remineralisation can stop bacterial metabolism (at high conc) to produce less acid
79
OH effects of smoking
``` staining PDD reduced sensation infection risk delayed healing halitosis caries black hairy tongue oral cancers ```
80
general effects of smoking
``` cancers COPD chest infections skin - wrinkling miscarriage asthma ```
81
nicotine addiction
7-10s to hit brain binds to nicotinic acetylcholine receptor - stimulates dopamine release = satisfaction drop in nicotine levels = craving and withdrawal
82
triangle of nicotine addiction
emotional attachment habit neurochemical changes (chemical addiction)
83
e-cigs
stimulate tobacco smoking through vapourised nicotine delivery without burning conventional tobacco
84
how effective are e-cigs at helping smokers to quit?
moderately effective ``` harm reduction hand to mouth habit maintained psychosocial aspect of addiction maintained reduction in withdrawal symptoms control of dosage ```
85
disadvantages of e-cigs
safety gateway theory: uptake of cigs renormalisation of cigs
86
signs of nicotine poisoning
nausea and vomiting dizziness headache
87
nicotine withdrawal
``` irritability anxiety headaches craving depression disturbed sleep weight gain ```
88
champix
active ingredient varenicline - stimulates nicotinic receptors - relieves craving and withdrawal symptoms - also blocks nicotine from acting on nicotinic receptors - prevents rewarding and enjoyable effects of nicotine = not NRT
89
behaviour change wheel COM-B stages
``` identify target behaviour(s) assess underlying reasons - COM-B ways to change/maintain behaviour - barriers and facilitators techniques (BCTs) implement and evaluate - inc feasibility (APEASE) ```
90
APEASE feasibility
``` Acceptability Practicability Effectiveness Affordability Safety (SEs) Equity ```
91
chronic heavy drinking oral issues
``` oral cancer oral ulceration glossitis angular cheilitis gingivitis - nutritional deficiency trauma xerostomia (dehydration) poor wound healing and OM erosion bruxism ```
92
sources of behaviour
``` capability - physical - psychological opportunity - social - physical motivation - automatic - reflective ```
93
aspects of the com b behaviour change wheel
sources of behaviour intervention fcts policy
94
chronic heavy drinking medical issues
``` GIT - acute gastritis - liver problems - GI bleeding - malnutrition - cancers heart - arrhythmias - cardiomyopathy - hypertension traumatic injuries skin, muscles, nerves and bones - osteoporosis blood - macrocytosis - thrombocytopenia - leucopenia Obs-Gyn problems other - poor wound healing, bleeding - immune system - mental health ```
95
what do screening tests do?
identify people who need more comprehensive assessment for substance misuse disorders doesn't make involved diagnosis/assessment
96
oral cancer and alcohol
ethanol metabolite acetaldehyde promotes tobacco initiated tumours damages DNA and alters oncogene production alcohol facilitates absorption of carcinogenic substances across mucosa - partly due to thinning (nutritional deficiency)
97
alcohol screening tests
AUDIT FAST CAGE
98
types of drinking
hazardous harmful dependent
99
brief motivational interventions
``` Feedback Responsibility Advice Menu of options Empathic Self-efficacy ```
100
CMO low risk guidelines
don't regularly drink >14 units per week - spread evenly over ≥3 days heavy drinking sessions - increased risk of death from long-term illnesses and accidents and injuries risk of illnesses (inc cancer) increases with any amount you drink on a regular basis if want to cut down - have several drink free days each week
101
single occasion drinking guidelines
limit total amount drink more slowly with food, alternate with water avoid risky places and activities make sure you have people you know around you ensure you can get home safely
102
3 common risk indices
absolute relative (/) attributable (-)
103
mainstream smoke
smoker inhales then exhales
104
sidestream smoke
wafts off end of lit cigarette, more dangerous - more carcinogen
105
3rd hand smoke
carcinogen laden residue that builds up on surfaces
106
confounding variable
variable which for some reason was left uncontrolled | multiple variables not one exerting influence on outcome of study
107
null hypothesis
when making definitive statement impossible to prove therefore a false statement can be made (null) which is then disproven
108
p value
probability of obtaining results at least as extreme as the results actually observed during the test, assuming that the null hypothesis is correct - how likely it is to get a result like this if the null hypothesis is true could you get this result from luck? <0.05 data is significant
109
CASP
Critical Appraisal Skills Programme
110
CASP components
A - are the results valid? B - results? C - will the results help locally?
111
intention to treat ITT
analyse the data as though the switchers were still in the new agent group more conservative (preferred) pragmatic - in real life this will happen drop outs - can input data
112
per protocol
analyse data according to tx actually received efficacy to explain the effects of the intervention itself both groups need to be treated exactly the same apart from the factor you are investigating
113
care bundle
a set of EB interventions that when used together significantly improves outcomes aims to ensure pts receive optimum care at every contact
114
split mouth design advantages
each participant acts as own control - reduce inter-individual variation both control and intervention exposed to same env therefore fewer participants required to obtain same study power as parallel group every participant receives each intervention therefore good for determining preferences
115
split mouth design disadvantages
carry across effects "leakage" selection of pts (need to have matching carious teeth) might limit external validity statistical analysis more complicated, isn't usually done pt can't be blinded
116
bundle
data collection tool to sample whether optimum care is being delivered
117
factors contributing to adverse events
human structural clinical
118
QI/clinical governance
systematic approach to maintaining and improving the quality of pt care within a health system
119
CG components
``` education and training (CPD) clinical audit clinical effectiveness (EBD) research and development openness: Duty of Candour risk management - to pts and practitioners ```
120
clinical guidelines
systematically developed statements which assist in the decision making about appropriate HC for specific clinical conditions
121
aims of clinical guidelines
improve quality of HC provide recommendations for tx and care be used to develop standards for clinical audit be used in education and training of HCPs help pts make informed decisions improve communication between pt and HCP
122
how much CPD?
100 hours verifiable CPD within 5yr cycle and at least 10hrs verifiable every 2yrs
123
CPD highly recommended topics (pt safety)
MEs: at least 10hrs per cycle, at least 2hrs pa disinfection and decon ≥5hrs every cycle radiography and radiation protection: at least 5hrs per cycle
124
other CPD recommended areas
ethical and legal issues complaints handling oral cancer: early detection safeguarding
125
clinical audit definition
a QI process that seeks to improve pt care and outcomes through SR of care against explicit criteria and the implementation of change
126
uses of clinical audit
``` observe gaps in knowledge learning attitudes protocol training ```
127
clinical audit stages
``` select/identify problem/topic set criteria observe practice and collect data analyse data, determine any deviation from standard identify any areas of change required make changes ```
128
SEA
``` identify event collect info set meeting to discuss meet and undertake structured analysis implement changes and monitor progress write up SEA report seek external feedback ```
129
2 things to do after audit cycle
implement changes | repeat audit
130
need
what people could benefit from
131
demand
what people want
132
supply
what is provided
133
considering need
``` normative felt expressed comparative unmet ```
134
influences on need, supply, demand
``` current research agenda medical knowledge £ historical patterns medical influence: prevention or tx? public and political pressure media social and educational influence ``` = not static
135
SDNAP objectives
``` health needs assessment 1 - examine and describe the pop 2 - identify needs of pop 3 - examine current service provision 4 - identify how gaps can be met ```
136
DPH
health protection health promotion healthcare PH
137
7 special HBs and one PH body
``` PH Scotland HIS SAS NHS National Waiting Times Centre State Hospitals Board for Scotland NHS24 NES NSS ```
138
stages of HC planning
cyclical constant process ``` assessment of need options decisions on policy available resources implementation evaluation (review) ```
139
OHIP 2018 key domains
``` focus on prevention reduce oral health inequalities meet needs of an ageing pop more services on high st improving info for pts quality assurance and improvement workforce finance ```
140
SPIKES
``` setting perception information/invitation knowledge empathy summarise and strategy ```
141
diversity
acknowledgement of alterity
142
equity
equal outcome
143
categories of discrimination
``` direct indirect associative perceived harassment victimisation instruction to discriminate ```
144
stress physiology
endocrine system hypothalamus increased cortisol
145
stress RFs
``` demand control support relationships role change ```
146
burnout
process where a prev committed professional disengages from their work in response to stress and strain experienced in the job exhausted dissatisfaction with themselves negative indifferent or cynical attitude
147
MBI 3 scales: Maslach Burnout Inventory
emotional exhaustion depersonalisation personal accomplishment
148
resilience
process of adapting well in the face of adversity, trauma, tragedy and threats
149
4 basic ingredients of resilience
awareness thinking reaching out fitness
150
complaints stages
``` frontline resolution (≤5 WDs) investigation ( ≤20 WDs) independent external review - NHS - SPSO (pt has 12m) - private - HIS or DCS - 6m ```
151
values
subcategory of beliefs determinants of what we are likely to do hierarchy - can conflict value clarification
152
criteria of a value
``` chosen freely chosen from alternatives chosen after thoughtful consideration of consequences of alternatives we prize this choice we affirm it to others act upon it act upon it repeatedly ```
153
values and conscience intertwined
act on our conscience because of our values | values also form our conscience
154
troubled conscience
acting against our value system
155
how are values expressed?
in our voluntary actions
156
moral distress
others' decisions trouble us
157
are values related to ethics?
may/may not be
158
primary sources
single research source
159
secondary sources
multiple papers, synthesising together
160
SRs
literature review that uses systematic methods to collect secondary data, critically appraise research studies and synthesise studies designed to provide a complete, exhaustive summary of current evidence relative to a research Q often quicker and cheaper than embarking on a new study
161
key characteristics of a SR
``` 1 - well-formulated Q 2 - comprehensive data search 3 - unbiased selection and abstraction process 4 - assessment of papers 5 - synthesis of data ```
162
non-systematic reviews
typically invited contributions created by experts to provide an overview or broad summary of what is happening in a particular field nature means they are susceptible to bias authors may not clearly state the methodology used, and may be selective in presenting evidence to support a particular, pre-existing view
163
SRs vs single studies
save readers time provide reliable evidence resolve inconsistencies identify gaps (catalyst for better studies) identify when Qs have been fully answered explore differences between studies
164
why are SRs important?
``` reduce large quantities of information into manageable portions formulate policy and develop guidelines efficient use of resources increased power/precision limit bias and improve accuracy ```
165
authors for SRs
≥2 topic expert methodological expert
166
study protocol for SRs
in advance set out what they plan to do methodologically (so you don't deviate from procedures during it)
167
the process for SRs
``` authors study protocol specific Q search strategy inclusion/exclusion criteria critical appraisal synthesis ```
168
SRs specific Q
using PICO
169
SRs search strategy
comprehensive and repeatable multiple electronic databases published and unpublished literature - research studies that haven't been published - hard to find look quite a long way back not just really recent ones ideally without language restrictions
170
SRs inclusion/exclusion criteria
specific | agreed in advance
171
SRs critical appraisal
systematic and thorough | risk of bias
172
SRs synthesis
qualitative (narrative) synthesis quantitative pooling of data in meta-analysis - relative precision and quality of the included studies
173
SRs well-formulated Q
PICO | inclusion criteria
174
how reliable are SRs?
depends - methodological quality of the included studies - quality of the SR itself - how well was the review conducted? - AMSTAR2/ROBIS - checklists to assess how well SR has been done
175
Cochrane
evidence tool to enhance healthcare knowledge and decision making for anyone interested in using high quality info to make health decisions global independent network gathers and summarises the best evidence from research - informed choices does not accept commercial or conflicted funding
176
SR - where should all of the steps be described?
in the review protocol
177
what is the first step in the SR process?
protocol development | - it should be registered
178
declaration of helsinki
every clinical trial must be registered in a publically accessible database before recruitment of the first subject
179
reporting bias SRs
statistically significant 'positive' results are: - more likely to get published - publication bias - more likely to be published rapidly - time lag bias - more likely to be published in english - language bias - more likely to be cited by others - citation bias
180
unbiased selection and abstraction process SRs
selection of relevant papers data extraction to a predefined data extraction form conducted independently by at least 2 reviewers - done in duplicate - if don't agree can get a 3rd to adjudicate clear description of reasons for exclusion adequate description of inc studies details of studies funding sources
181
assessment of papers
how well studies have been designed and conducted (methodologically) independently by at least 2 reviewers - if don't agree can get a 3rd to adjudicate results of assessment should be reflected in analysis
182
'quality' assessment tools
composite scales | component approach
183
'quality' assessment tools - composite scales
assign numerical value to individual items to provide overall estimate of quality problematic - can get same score for different reasons
184
'quality' assessment tools - component approach
assess relevant methodological aspects individually e.g. randomisation, blinding, drop outs preferred
185
risk of bias assessment
bias determines extent to which results of studies can be believed a study conducted to the highest possible standards can still have risk of bias direction of bias: causes overestimation or underestimation of tx effect magnitude of bias
186
study risk of bias table
each author does independently then come together to compare judge each category as low/unclear/high risk and include comment re support for judgement ``` random sequence generation (selection bias) allocation concealment (selection bias) blinding - outcome assessors blinding - participants incomplete outcome data (attrition bias) selective reporting (reporting bias) other bias ``` can form a summary table and a summary graph
187
SR synthesis of data
appropriate pooling - qualitative (narrative) - quantitative (MA) - inappropriate when data are sparse or when heterogeneity exists clear presentation of individual studies inc in the review
188
MA potential advantages
an increase in power an improvement in precision the ability to answer Qs not posed by individual studies
189
MAs have potential to mislead and should only be undertaken when:
minimal differences in characteristics across studies same outcome measure data in each study are available - data needs to be extractable
190
SRs - why use risk of bias?
in practice, impossible to measure the amount of bias in a study so do risk of bias assessment
191
dealing with risk of bias
variation in risk of bias may be an explanation for heterogeneity between results of different studies - sensitivity analyses a significant risk of bias in included studies should give rise to cautious conclusions in a SR - you want them to be a low risk of bias
192
what is a MA?
the process of using statistical methods to combine the results of different studies aim - integrate findings, pool data - identify the overall trend of results optional part of a SR calculates a tx effect based on pooled data from a group of studies estimates a common tx effect across studies improves the precision of a point estimate by using all available data - getting more participants
193
different types of data
dichotomous (binary) continuous = whatever type - calculate a single summary statistic to represent the effect found in each study - usually 95% CIs
194
choice of summary statistic for dichotomous data
``` odds ratio risk ratio %/relative risk reduction risk difference or absolute risk reduction NNT ```
195
choice of summary statistic for continuous data
weighted mean difference: when all outcomes are using the same scale standardised mean difference: for when all the studies are assessing the exact same outcome but do it in a variety of ways
196
weighting studies
more weight given to studies which give us more info: - more participants - more events (e.g. prevalence of disease) - lower variance - may not be able to tell from plot whether variation is lower
197
types of heterogeneity
clinical methodological statistical
198
clinical heterogeneity
variation in participants, interventions, outcomes, study design
199
methodological heterogeneity
variation in methods used in studies e.g. quality of allocation concealment
200
statistical heterogeneity
excessive variation in the results of studies | variation in tx effects above that expected by chance
201
identifying heterogeneity visually
if studies are estimating the same thing we would expect CIs to overlap to a large extent statistical heterogeneity may appear in forest plots as poor overlap of CIs - if CIs don't overlap - can say there is a lot of heterogeneity look for outliers
202
interpretation of forest plot
if the CI crosses the line of no effect, this is equivalent to saying that there is insufficient evidence for a difference in the effects of the 2 interventions
203
cumulative meta-analysis
updates as each trial becomes available | recalculate RR and CI
204
chi squared test of heterogeneity
p <0.1 demonstrates statistically significant heterogeneity | - may not be appropriate to pool data
205
I squared statistic
% variation due to heterogeneity rather than chance <50% acceptable represents level of statistical heterogeneity
206
sensitivity analysis
does result change according to small variations in data and methods - choice of tx effects of method for pooling - inclusion/exclusion of dubious data - inclusion/exclusion of trials should set out plans in protocol if going to include/exclude some data from meta-analysis - study quality/reasons that make it different to others - see if it makes a difference a common sensitivity analysis is to repeat the analysis taking out lower quality trials
207
Cochrane GRADE
``` Grading of Recommendations Assessment Development and Evaluation evaluates the quality of the body of evidence (MA) high, mod, low, v low e.g. certainty, heterogeneity, risk of bias ```
208
subgroup analysis
where it is suspected in advance that certain features may alter the effect of an intervention e.g. gender, age groups, specific disease subtypes (mild/mod/severe) need to predefine subgroups before you start - can't do it when you see the results
209
fixed effects
assumes that the studies are so similar that they are effectively different parts of one large study assumes that the 'true' answer for each study is the same
210
random effects
assumes that the studies are slightly different assumes that the 'true' answer for each study will be slightly different from the 'true' answer of the others wider CI more conservative - prefer it unless really good reason to believe fixed effects
211
5 factors that can lower quality
high or unclear risk of bias inconsistency between studies (heterogeneity) indirectness (PICO) imprecision - numbers and CIs publication bias - likely that negative/null results not published?
212
summary of findings table
``` summary of key findings from a SR presents: - quality of evidence - magnitude of the effect - reasons behind judgements format: - PICO - outcomes - results ```
213
improving reporting standards
CONSORT EQUATOR COMET
214
CONSORT
evidence-based minimum set of recommendations for reporting RCTs shown to improve quality of reporting
215
EQUATOR
enhancing the quality and transparency of health research
216
COMET
core outcome measures in effectiveness trials | - stipulate which outcomes should be used in all clinical trials
217
disadvantage of cochrane reviews
don't incorporate human factors e.g. seeking HC, tx compliance, if they don't change their behaviour etc
218
registered trials
Trials registries - gov international committee of medical journal editors (ICMJE) declaration of helsinki