Table 2.
Pregnancy characteristics of cases and controls
| Characteristics | Cases | Controls | ||
|---|---|---|---|---|
| N | (%)a | N | (%)a | |
| Birth rank of index child | ||||
| First | 138 | (43.4%) | 139 | (43.9%) |
| Second | 102 | (32.1%) | 99 | (31.2%) |
| Third+ | 78 | (24.5%) | 79 | (24.9%) |
| Type of delivery | ||||
| Vaginal | 259 | (81.2%) | 272 | (86.3%) |
| Caesarean | 60 | (18.8%) | 43 | (13.7%) |
| Length of pregnancy | ||||
| Normal | 257 | (81.3%) | 255 | (81.2%) |
| Premature | 25 | (7.9%) | 9 | (2.9%) |
| Overdue | 34 | (10.8%) | 50 | (15.9%) |
| Spotting/cramping/abnormal | ||||
| vaginal bleeding during pregnancy | 67 | (21.1%) | 37 | (11.9%) |
| Number of pregnanciesb | 3.1 | (1.6) | 3.2 | (1.6) |
| Previous pregnancies | 0.4 | (0.9) | 0.4 | (0.8) |
| Stillbirths/miscarriages/abortions | ||||
| Living infants | 2.6 | (1.3) | 2.7 | (1.3) |
| Number of prenatal visitsb | 13.3 | (4.1) | 13.5 | (4.8) |
| Index child birth weight (lbs)b | 7.4 | (1.4) | 7.5 | (1.1) |
| Age at index child birth (years)b | ||||
| Paternal | 29.0 | (5.9) | 29.0 | (6.4) |
| Maternal | 26.2 | (5.2) | 26.2 | (5.2) |
a
percentage of respondents to each question (excluding unknowns)
b
mean (standard deviation)