Table 1.
Covariates in relation to immigration status in controls and in relation to the risk of childhood autism
| |
Immigration |
|
Relationship between covariates and childhood autism p-value
a
|
|||
|---|---|---|---|---|---|---|
| Covariates | Both parents Finnish n (%) | Mother only immigrated n (%) | Father only immigrated n (%) | Both parents immigrated n (%) | p-value a | |
| Maternal age (≥median, 29 years) |
2 386 (55.9) |
48 (60.0) |
48 (62.3) |
34 (36.6) |
0.001 |
<0.001 |
| mean (years) |
29.5 |
30.3 |
30.1 |
27.4 |
|
|
| SD (years) |
5.3 |
5.2 |
5.2 |
4.7 |
|
|
| Paternal age (≥median, 32 years) |
2 055 (48.2) |
47 (58.8) |
41 (53.3) |
58 (62.4) |
0.01 |
0.003 |
| mean (years) |
31.9 |
35.7 |
32.6 |
33.0 |
|
|
| SD (years) |
5.9 |
7.7 |
6.7 |
5.8 |
|
|
| Smokingb |
714 (17.2) |
10 (13.2) |
10 (13.2) |
1 (1.2) |
<0.001 |
0.77 |
| Previous births (≥2) |
1 105 (25.9) |
15 (18.8) |
18 (23.4) |
36 (38.7) |
0.02 |
0.22 |
| Pre-term birth (<37 weeks) |
229 (5.4) |
8 (10.0) |
1 (1.3) |
7 (7.5) |
0.08 |
0.06 |
| Low birthweight (<2500 g) |
135 (3.2) |
3 (3.8) |
0 (0) |
3 (3.2) |
0.45 |
<0.001 |
| mean (g) |
3598 |
3558 |
3580 |
3539 |
|
|
| SD (g) | 546 | 450 | 490 | 529 | ||
aX2 test, bfrequency missing = 47 cases, 132 controls. OR=odds ratio, CI=confidence interval.