Table 1 Description of the study population
Variable | Cases | Controls | P-value |
|---|---|---|---|
Marital status, n (%) | 0.036 | ||
Single | 37 (7.1) | 42 (8.1) | |
Stable couple | 161 (31.1) | 124 (23.9) | |
Married | 320 (61.8) | 352 (68.0) | |
Education level, n (%) | 0.084 | ||
Primary | 112 (21.6) | 93 (17.9) | |
High school, not ended | 42 (8.1) | 28 (5.4) | |
High school | 185 (35.7) | 190 (36.7) | |
University | 179 (34.6) | 207 (40.0) | |
Previous preterm/low birthweight newborn (yes), n (%) | 64 (12.4) | 26 (5.0) | < 0.001 |
Kessner index (prenatal care), n (%) | 0.737 | ||
Adequate | 259 (50.0) | 253 (48.8) | |
Intermediate | 185 (35.7) | 182 (35.2) | |
Inadequate | 74 (14.3) | 83 (16.0) | |
Smoking during pregnancy, n (%) | 149 (28.8) | 80 (15.4) | < 0.001 |
Preeclampsia, n (%) | 46 (8.9) | 11 (2.1) | < 0.001 |
Weight gain throughout pregnancy (g/week), mean (SD) | 278 (121) | 310 (114) | < 0.001 |
Body mass index in the first trimester of pregnancy (Kg/m2), mean (SD) | 23.1 (4.5) | 23.9 (4.1) | < 0.001 |
Alcohol intake (g/week), mean (SD) | 4.2 (18.5) | 3.1 (15.2) | 0.312 |
Fish intake (g/day), mean (SD) | 83.4 (48.4) | 92.0 (57.0) | 0.009 |
Gestational age (days), mean (SD) | 271 (11) | 276 (9) | < 0.001 |
Delivery by caesarean, n (%) | 127 (24.2) | 120 (23.2) | 0.854 |