Variables | Respondents | Non-respondents | p-value* | |
---|---|---|---|---|
n = 1500 | n =1496 | |||
No (%) | No (%) | |||
Maternal factors | ||||
Fish consumption | ||||
<1 time a month | 252 (16.8) | 307 (20.7) | 0.001 | |
1–4 times a month | 815 (54.3) | 823 (55.5) | ||
≥2 times a week | 433 (28.9) | 352 (23.8) | ||
Shellfish consumption | ||||
<1 time a month | 1004 (66.9) | 982 (65.9) | 0.57 | |
≥1 time a month | 496 (33.1) | 507 (34.1) | ||
Age (years) | ||||
<28 | 445 (29.7) | 535 (35.8) | <0.001 | |
28 ≤ age < 32 | 542 (36.1) | 524 (35.0) | ||
≥32 | 513 (34.2) | 437 (29.2) | ||
Education | ||||
≤12 years | 497 (33.2) | 659 (44.2) | <0.001 | |
>12 years | 1000 (66.8) | 832 (55.8) | ||
Tobacco smoke at the beginning of pregnancy | ||||
No | 1126 (75.6) | 992 (67.2) | <0.001 | |
Yes | 364 (24.4) | 484 (32.8) | ||
Folic acid supplementation | ||||
Yes | 251 (17.0) | 235 (16.1) | 0.50 | |
No | 1225 (83.0) | 1226 (83.9) | ||
Child/perinatal factors | ||||
Child’s sex | ||||
Male | 772 (51.5) | 747 (50.0) | 0.40 | |
Female | 727 (48.5) | 748 (50.0) | ||
Cesarean section | ||||
Yes | 255 (17.3) | 258 (17.6) | 0.84 | |
No | 1218 (82.7) | 1208 (82.4) | ||
Preterm birth (<37 weeks of gestation) | ||||
Yes | 49 (3.3) | 60 (4.0) | 0.26 | |
No | 1447 (96.7) | 1422 (96.0) | ||
Small-for-gestational age (<10th percentile) | ||||
Yes | 97 (6.5) | 94 (6.3) | 0.84 | |
No | 1401 (93.5) | 1400 (93.7) | ||
No. of siblings at birth | ||||
0 | 645 (43.2) | 667 (44.6) | 0.68 | |
1 | 562 (37.6) | 548 (36.7) | ||
≥2 | 287 (19.2) | 276 (18.5) |