lecture 7 Flashcards
prevalence
proportion of a population who have a specific characteristic in a given time period
how us estimated prevalence calculated
if you know info on the samples of the population of interest
how is prevalence calculated
if info of the entire population is provided
prevalence in uk
4.1 per 1000
prevalence gender
affects men slightly more often than women
onset
late adolescence and early adulthood
estimated annual prevalence uk
0.4 or 4 per 1000
incidence
a measure of the number of new cases of a characteristic that arise in a population over a given period
cost of psychosis per year
£11.8 billion a year
other psychotic disorders
schizoaffective disorder, delusional disorder and schizophreniform disorder and brief psychotic disorder
schizoaffective disorder symptoms of
both schizophrenia and mood disorder - rewires having a major depressive or mania episode
delusional disorder
having delusions -persecution , jealousy , grandeur - no other symptoms of schizophrenia
schizophreniform disorder
symptoms must include either delusions hallucinations or disorganised speech
schizophreniform disorder duration
greater than 1 month but less than 6 months
brief psychotic disorder
symptoms must include either hallucinations, delusions or disorganised speech
brief psychotic disorder duration
1 day to 1 month
brief psychotic disorder triggered bt
extreme stress or bereavement
behavioural genetic studies show that schizophrenia is
substantially heritable - 80% of the variance in schizophrenia scores is estimated to be attributable to genetic factors
heritability
proportion of variance that is accounted by genetic factors in a given population
example study of twin study
estimated heritability 79%
concordance rate - 33% for MZ twins and 7% for DZ` Twins
concordance
presence of the same trait in both members of the pair twins
family studies
first degree relatives are 18 times are likely to develop schizophrenia
gottesman
MZ- 48%
DZ-17%
The genain quadruplets
all four developed schizophrenia
