Table 3.
Motives for study participation. Raters who categorized the motives were blinded from all information on the study participants including diagnosis.
| Unaffected controls | Schizophrenia | Statistic a | ||
|---|---|---|---|---|
| Motives: | Frequency (%) | Frequency (%) | χ2 | p-value |
| Altruism | 4326 (96.9) | 2315 (83.7) | 424.2 | < 0.0001 |
| Personal benefit | 45 (1.0) | 260 (9.4) | ||
| Social influence | 79 (1.8) | 132 (4.8) | ||
| De-stigmatization | 7 (0.16) | 34 (1.2) | ||
| Reward | 9 (0.20) | 26 (0.94) | ||
a
Pearson χ2 test.
There were statistically significant differences in the distribution of motives for study participation between unaffected controls (n=4466) and schizophrenia (n=2767).