Kety Flashcards
what was the aim?
to see if there’s a genetic basis for schizophrenia
to see if there’s a higher schizophrenia-related illness among biological relatives than adoptive relatives
what was the IV?
schizophrenia sufferers and a control group with no history of mental illness
what was the DV?
the prevalence of schizophrenia-related illness among family members
what was the sample/ppts?
34 schizophrenic patients aged 20-43
what was the procedure?
1-Kety used Danish family records to locate adoptive and biological relatives of all ppts
2-tracked down relatives and used mental health register to assess mental status
3-panel of psychiatrists used medical records to diagnose family members-blind test-didn’t know if records were from bio or adop relative
4-diagnoses made-identities revealed and assigned to adoptive group (IA CA) or bio group(IB CB)
-psychiatrists diagnosed family based on medical records and classified them as Schz or not
what was the results?
- research found more signs of schz spectrum disorder in index ppts’ bio family than adop family
- of 150 bio relatives of index cases- 13 had a diagnosis of schz,uncertain schz or inadequate personality
what was the conclusions?
- genetic component to schz
- schz adoptees more likely to have schz in bio fam than adop fam
what were the controls?
33 mentally healthy controls selected from Danish Adoption Registry-matched with schz patients on age,gender,age at which they were adopted,social class of adop family
How many mz twins were there?
2
where were the ppts taken from?
Danish Adoption Register in Copenhagen
how many relatived did they track down?
463
how many psychiatrists were on the panel?
4
how many cases were dropped due to not reaching a conclusion?
4
GENERALSIABILITY
+large sample
+covers range of ages-teens to men and women in 40s
+men and women
-ethnocentric-same location and culture-not representatives to wider population
RELIABILITY
+reliable procedure-replicated in 1975.1978,1994
+inter-rater reliability (4 psychiatrists)
