Public Health / GP Flashcards
What are 4 determinants of health according to Lalonde Report, 1974
Genes, Environment (physical + socioeconomic), Lifestyle, Health care
What is the difference between equity and equality
Equity = what is fair and just
Equality is concerned with equal shares
Horizontal vs Vertical equity
Horizontal = equal treatment for equal need
Vertical = Unequal treatment for unequal need
What are the 3 domains of public health practice
- Health protection (measures to control infectious disease risks)
- Health improvement (societal interventions)
- Health care (delivery of safe high quality services)
Name a public health intervention at individual level, community level and ecological (population) level
Individual - immunisation
Community - playground for local community
Ecological - Clean Air Act
What is the difference between secondary and tertiary prevention?
Secondary Prevention - trying to detect a disease early and prevent it from getting worse (Screening)
Tertiary Prevention - trying to improve your quality of life and reduce the symptoms of a disease you already have
When we want to improve the health of a population or population subgroup, we start with a heath needs assessment, followed by which other phases of the planning cycle?
(Needs Assessment) > Planning > Implementation > Evaluation
What is the difference between Need, Demand and Supply?
Need - ability to benefit from an intervention
Demand – what people ask for
Supply – what is provided
Give a definition of Health Needs Assessment
a systematic method for reviewing the health issues facing a population, leading to agreed priorities and resource allocation that will improve health and reduce inequalities
What’s the difference between a Health Need and a Health Care Need?
- Health need
Need for health
Concerns need in more general terms
e.g. measured using mortality, morbidity, socio-demographic measures - Health care need
Need for health care
Much more specific
Ability to benefit from health care
Depends on the potential of prevention, treatment and care services to remedy health problems
(Bradshaw) - What is the difference between a Felt Need, an Expressed Need, a Normative Need and a Comparative Need
- Felt need - individual perceptions of variation from normal health
- Expressed need - individual seeks help to overcome variation in normal health (demand)
- Normative need - professional defines intervention appropriate for the expressed need
- Comparative need - comparison between severity, range of interventions and cost
(PH Faculty) - What are the 3 different approaches to Health Needs Assessment?
Epidemiological, Comparative, Corporate
What are some problems with the Epidemiological approach to Health Needs Assessment?
- Required data may not be available
- Variable data quality
- Evidence base may be inadequate
- Does not consider felt needs of people affected
What are some problems with the Comparative approach to Health Needs Assessment?
- May not yield what the most appropriate level
e.g. of provision or utilisation should be - Data may not be available
- Data may be of variable quality
- May be difficult to find a comparable population
What are some problems with the Corporate approach to Health Needs Assessment?
- May be difficult to distinguish need from
demand - Groups may have vested interests
- May be influenced by political agendas
- Dominant personalities may have undue influence
How does the Epidemiological approach to Health Needs Assessment work?
- Define problem
- Size of problem
- Services available
- Evidence base
- Models of care
- Existing services
- Recommendations
How does the Comparative approach to Health Needs Assessment work?
Compares the services received by a population (or subgroup) with others (may examine: Health status, Service provision, Service utilisation, Health outcomes)
How does the Corporate approach to Health Needs Assessment work?
Not to do with corporations. It is about obtaining the views a range of stakeholders (Commisioners/Providers/Professionals/Patients/Press/Politicians) (Some may give their views even when not sought or seek to influence health needs assessments)
Give a definition of Evaluation of Health Services
Evaluation is the assessment of whether a service achieves its objectives
(Alternative: Evaluation attempts to determine as systematically and objectively as possible the relevance, effectiveness and impact of activities in the light of their objectives)
A widely used framework for health service evaluation proposed by Donabedian
Structure (what is there - buildings/staff/equipment)
Process (what is done - eg. no of patients seen @ A&E)
Outcome (eg. mortality, morbidity, QoL, satisfaction)
What are some issues with health outcomes?
- Link (cause and effect) between health service provided and health outcome may be difficult to establish as many other factors may be involved
- Time lag between service provided and outcome may be long
Large sample sizes may be needed to detect statistically significant effects - Data may not be available
- There may be issues with data quality
Maxwell’s Dimensions of Quality of Health Care (3Es and 3As)
- Effectiveness, Efficiency, Equity
- Acceptability, Accessibility, Appropriateness
Give a definition of epidemiology
study of the frequency, distribution and determinants of diseases and health-related states in populations in order to prevent and control disease
What is the difference between incidence and prevalence?
Incidence = New cases, Denominator (number of disease free people at the start of the study), Time
Prevalence = Existing cases, Denominator, Point in time (point prevalence)
What is person-time and when is it used?
Person-time is a measure of time at risk (i.e. time from entry to a study to (i) disease onset, (ii) loss to
follow-up or (iii) end of study)
It is used to calculate incidence rate which uses person-time as the denominator
No of persons who have become cases in a given time period DIVIDED BY Total person-time at risk during that period
Incidence rate
What are the usual headings used when describing the epidemiology of a disease?
Time, Place, Person
What is the difference between absolute and relative risk?
Absolute risk – gives a feel for actual numbers involved i.e. has units
(e.g. 50 deaths / 1000 population)
Relative risk – risk in one category relative to another i.e. no units
What is the difference between attributable and relative risk?
Attributable risk: The rate of disease in the exposed that may be attributed to the exposure (a type of absolute risk (absolute excess risk)
(i.e. incidence in exposed minus incidence in unexposed)
Relative risk: Ratio of risk of disease in the exposed to the risk in the unexposed
(i.e. incidence in exposed divided by incidence in unexposed)
What is bias?
A systematic deviation from the true estimation of the association between exposure and outcome
What are the 2 main groups of bias?
- Selection bias
A systematic error in: selection of study participants / the allocation of participants to different study groups - Information (measurement) bias
A systematic error in the measurement or classification of: exposure, outcome
What are three sources of information bias?
observer (e.g. observer bias), participant (e.g. recall bias), instrument (e.g. wrongly calibrated instrument)
What is confounding?
The situation where a factor is associated with the exposure of interest and independently influences the outcome (but does not lie on the causal pathway)
6 ‘criteria’ for causality
- Strength of association (magnitude of relative risk)
- Dose-response (the higher the exposure, the higher the risk of disease)
- Consistency (similar results from different researchers using various study designs)
- Temporality (does exposure precede the outcome?)
- Reversibility (removal of exposure reduces risk of disease)
- Biological plausibility (biological mechanisms explaining the link)
Select the term that most accurately describes the type of study:
Investigators find a high level of correlation between levels of socioeconomic deprivation and cardiovascular mortality across electoral wards in the UK
Ecological study
Select the term that most accurately describes the type of study:
Researchers set out to examine the association between alcohol consumption and stroke. They identify all new patients admitted with stroke and compare their alcohol consumption with patients admitted for elective surgery.
Case-control study
Select the term that most accurately describes the type of study:
General practitioners set up a study to estimate the prevalence of depression within their registered population. They decide to start with a random sample of adults aged 45-74 years
Cross-sectional study
Select the term which best describes the measure being used:
In a randomised controlled trial, the time at risk was determined from entry to the study to various end points
Person-time
Select the term which best describes the measure being used:
For patients with meningococcal meningitis, the risk of dying has been estimated to vary from 5-10%
Case fatality rate
Select the term which best describes the measure being used:
In a case-control study of recent alcohol consumption and road traffic accidents, the measure of association was substantially greater than 1 and indicates that there is a positive association between exposure and outcome
Odds ratio