Table 3.
Reported reasons for not participating in the STAR study
| Presumptive status | ||||
|---|---|---|---|---|
| Reasons for non-participation | Total N=746 |
Schizophren iaa N=213 |
Bipolar disorder N=125 |
Not- Affectedb N=408 |
| Personal | ||||
| One twin in a pair did not want to participate | 267 (35.8) | 87 (40.8) | 54 (43.2) | 126 (30.9) |
| Both twins did not want to participate | 230 (30.8) | 49 (23.0) | 38 (30.4) | 143 (35.0) |
| One twin in a pair was deceased | 18 (2.4) | 10 (4.7) | 1 (1.0) | 7(1.7) |
| Health related | ||||
| One/both twins did not want to participate due to psychiatric symptoms |
25 (3.4) | 13 (6.1) | 4 (3.2) | 8 (2.0) |
| One/both twins did not want to participate due to somatic problems |
73 (9.8) | 11(5.2) | 8 (6.4) | 54(13.2) |
| Twin not possible to localize | ||||
| Did not have a telephone number | 62 (8.3) | 23 (10.8) | 10 (8.0) | 29 (7.1) |
| Was not possible to reach – other reason | 64 (8.6) | 19 (8.9) | 8 (6.4) | 37 (9.1) |
| Unknown address | 1 (0) | 0 (0) | 0 (0) | 1 (0) |
| Unknown | 6 (0) | 1 (0.5) | 2 (1.6) | 3 (1.0) |
a
Schizophrenia and schizophrenia with affective features are here included in the category of schizophrenia.
b
Not-affected category includes those with a diagnosis of depression.