Table 2.
Numbers of Offspring With and Without Schizophrenia, Crude and Adjusted RRs, and 95% CI Associated With Immigration Status of the Parents
| Parental Immigration Status | Schizophrenia |
Crude RR | 95% CI | Adjusted RRa | 95% CI | Adjusted RRb | 95% CI | P Value | |
| − | + | ||||||||
| Neither parent | 27 563 | 192 | 1 | 1 | 1 | ||||
| Father only | 12 622 | 85 | 1 | 0.8–1.2 | 1 | 0.7–1.2 | 0.9 | 0.7–1.2 | 0.7 |
| Mother only | 10 843 | 81 | 1.1 | 0.8–1.4 | 1 | 0.8–1.3 | 1 | 0.8–1.3 | 0.9 |
| Both parents | 37 164 | 279 | 1 | 0.8–1.2 | 0.9 | 0.8–1.1 | 0.9 | 0.7–1.1 | 0.2 |
Note: RR, relative risk; CI, confidence interval.
a
Adjusted for paternal age.
b
Adjusted for paternal and maternal age, maternal education, paternal social class, sex, and birth order.