Gottesman and Shields study- twin studies (pack 3)

Question 1

aim

Answer 1

researchers aimed to see whether schizophrenia had a genetic basis. They examined records of patients in a psychiatric hospital over a sixteen- year period

Question 2

sample

Answer 2

57 schizophrenic patients that were one member of a twin
tracked down the other twin for each ppt
24 MZ
33 MZ

Question 3

how did they collect data

Answer 3

hospital records
self-report questionnaires
self-report interviews
personality testing

Question 4

what were the 4 categories patients could have been put into?

Answer 4

1) both proband twin and co-twin hospitalised with schizophrenia

2) both had hospitalisation, but co-twin had been given another diagnosis relating to schizophrenia

3) co-twin had some psychiatric abnormality, but nothing relating to schizophrenia

4) proband had schizophrenia, but co-twin diagnosed as clinically normal

Question 5

what were two results from the study?

Answer 5

1. concordance rates for schizophrenia were higher in F compared to M
2. Concordance rates for severe schizo were much higher in MZ than DZ

Question 6

two conclusions

Answer 6

1. schizo has a bio basis as the chance of developing it appears to be influenced by genes
2. not totally caused by genes otherwise concordance rate for MZ would be 100%, thus, social factors