| Controls n = 163 | Cases n = 121 | p-value |
Developmental delay at 3 years old | 4.3% (7) | 6.6% (8) | 0.429 |
Developmental characteristics |
|
|
|
Pervasive developmental disorder | 0.6% (1) | 1.7% (2) | 0.577 |
Attention deficit hyperactivity disorder | 0% (0) | 0.8% (1) | 0.426 |
Language difficulty | 2.5% (4) | 0.8% (1) | 0.398 |
Motor difficulty | 0% (0) | 1.7% (2) | 0.181 |
Intellectual disability | 1.2% (2) | 1.7% (2) | 0.763 |
Gestational weeks at delivery |
|
|
|
34 (n = 31) |
| 9.7% (3) |
|
35 (n = 31) |
| 3.2% (1) |
|
36 (n = 59) |
| 6.8% (4) |
|
38 (n = 68) | 2.9% (2) |
|
|
39 (n = 46) | 8.7% (4) |
|
|
40 (n = 49) | 2.0% (1) |
|
|