From: In-utero exposure to phenols and phthalates and the intelligence quotient of boys at 5 years
Study population (N = 452)a | Mother-son pairs not in the study population (N = 546)c | Pvaluesd | |||
---|---|---|---|---|---|
Characteristics | N | (%) | N | (%) | |
Recruitment center | |||||
Poitiers | 285 | (63) | 248 | (45) | |
Nancy | 167 | (37) | 298 | (56) | < 0.001 |
Parity | |||||
Nulliparous | 208 | (46) | 227 | (41) | |
≥ 1 | 243 | (53) | 319 | (58) | |
Missing | 1 | (0.2) | 0.15 | ||
Maternal education | |||||
≤ 2 years after high school | 197 | (44) | 262 | (48) | |
High school + 2 years | 105 | (23) | 114 | (21) | |
High school + 3 years | 145 | (32) | 152 | (28) | |
Missing | 5 | (1) | 18 | (3) | 0.22 |
Paternal education | |||||
≤ 2 years after high school | 224 | (50) | 259 | (47) | |
High school + 2 years | 97 | (21) | 91 | (17) | |
High school +3 years | 104 | (23) | 112 | (21) | |
Missing | 27 | (6) | 84 | (15) | 0.48 |
Household monthly revenue (euros) | |||||
≤ 1500 | 63 | (14) | 107 | (17) | |
1500–3000 | 275 | (61) | 296 | (57) | |
≥ 3000 | 113 | (25) | 135 | (25) | |
Missing | 1 | (0.2) | 8 | (1) | 0.04 |
Smoking during pregnancy | |||||
No | 348 | (77) | 383 | (70) | |
Yes | 102 | (23) | 161 | (29) | |
Missing | 2 | (0.4) | 2 | (1) | 0.01 |
Maternal psychological difficultiesb | |||||
No | 321 | (71) | 356 | (65) | |
Yes | 130 | (29) | 186 | (34) | |
Missing | 1 | (0.2) | 4 | (1) | 0.06 |
Was breastfeed | |||||
Never | 127 | (28) | 143 | (26) | |
Yes | 325 | (72) | 396 | (72) | |
Missing | 7 | (1) | 0.58 | ||
Mean | (SD) | Mean | (SD) | ||
Maternal age at pregnancy | 29.9 | (4.7) | 28.7 | (5.0) | < 0.001 |
Total HOME score | 17.3 | (2.3) | 17.0 | (2.2) | 0.14 |
Body Mass Index (kg/m2) | 23.5 | (4.6) | 22.9 | (4.5) | 0.05 |
Child age at IQ assessment | 5.7 | (0.1) | 5.7 | (0.2)c | 0.73 |