Table 2.
Distribution of maternal characteristics of cases (n=293) and controls (n=1162)
| Cases n (%) |
Controls n (%) |
|
|---|---|---|
| Maternal age (yrs) | ||
| < 25 | 25 (9) | 95 (8) |
| 25–29 | 112 (38) | 509 (44) |
| 30–34 | 122 (42) | 416 (36) |
| ≥ 35 | 34 (12) | 142 (12) |
| Highest education level obtained (yrs) | ||
| ≤ 12 | 55 (19) | 167 (15) |
| > 12 | 237 (81) | 983 (85) |
| Annual household income ($ Can) | ||
| <35,000 | 50 (17) | 111 (10) |
| 35,000–69,999 | 110 (38) | 502 (43) |
| ≥70,000 | 133 (45) | 549 (47) |
| Prepregnancy Body mass index (kg/m2) | ||
| <19.8 | 87 (29) | 191 (17) |
| 19.8–25.9 | 152 (52) | 699 (60) |
| 26.0–29.9 | 28 (9) | 143 (12) |
| >29.9 | 23 (8) | 120 (10) |
| Missing | 5 (2) | 9 (1) |
| Parity | ||
| Nulliparous | 201 (69) | 555 (48) |
| Parous | 91 (31) | 595 (51) |
| Maternal smoking* | ||
| Never or only before the 3rd trimester | 253 (86) | 1086 (93) |
| Ever in the 3rd trimester | 40 (14) | 76 (7) |
| Passive smoking at home* | ||
| Yes | 36 (12) | 78 (7) |
| No | 256 (88) | 1072 (93) |
| Coffee consumption* | ||
| Yes | 153 (52) | 526 (46) |
| No | 139 (48) | 624 (54) |
| Alcohol consumption* | ||
| Yes | 130 (45) | 431 (37) |
| No | 162 (55) | 719 (63) |
| History of chronic disease | ||
| Yes | 29 (10) | 84 (7) |
| No | 263 (90) | 1066 (93) |
| Preeclampsia* | ||
| Yes | 25 (9) | 52 (5) |
| No | 267 (91) | 1098 (95) |
*
During pregnancy