Table 1.
Demographic and health characteristics of the study population stratified by case–control status*
(Number and percentage values)
| Cases (n 284) | Controls (n 660) |
|||
|---|---|---|---|---|
| Characteristics | n† | % | n† | % |
| Age (years) | ||||
| 18–24 | 23 | 8·1 | 58 | 8·8 |
| 25–34 | 55 | 19·4 | 125 | 18·9 |
| 35–44 | 138 | 48·6 | 329 | 49·9 |
| 45–49 | 68 | 23·9 | 148 | 22·4 |
| Race | ||||
| Caucasian | 230 | 81·0 | 547 | 82·9 |
| African American | 9 | 3·2 | 29 | 4·4 |
| Asian American | 19 | 6·7 | 41 | 6·2 |
| Other | 25 | 8·8 | 41 | 6·2 |
| Income ($) | ||||
| < 35 000 | 83 | 29·2 | 180 | 27·3 |
| 35 000–49 999 | 60 | 21·1 | 145 | 22·0 |
| 50 000–69 999 | 71 | 25·0 | 134 | 20·3 |
| 70 000 + | 60 | 21·2 | 183 | 27·8 |
| Education (years) | ||||
| < 12 | 6 | 2·1 | 21 | 3·2 |
| 12 | 47 | 16·6 | 119 | 18·0 |
| > 12 | 231 | 81·3 | 520 | 78·8 |
| BMI (kg/m2) | ||||
| Underweight (< 18·5) | 7 | 2·5 | 13 | 2·0 |
| Normal (18·5–24·9) | 144 | 50·7 | 345 | 52·3 |
| Overweight (25–29·9) | 72 | 25·4 | 164 | 24·9 |
| Obese (> 30) | 60 | 21·1 | 133 | 20·2 |
| Smoking | ||||
| Present | 55 | 19·4 | 103 | 15·6 |
| Former | 66 | 23·2 | 162 | 24·6 |
| Never | 163 | 57·4 | 395 | 59·9 |
| Alcohol use | ||||
| Present | 154 | 54·2 | 292 | 44·2 |
| Former | 51 | 18·0 | 140 | 21·2 |
| Never | 78 | 27·5 | 228 | 34·6 |
| Parity (any live births) | ||||
| Parous | 148 | 52·1 | 467 | 70·8 |
| Nulliparous | 136 | 47·9 | 192 | 29·1 |
| History of infertility | ||||
| Yes | 66 | 23·2 | 86 | 13·0 |
| No | 218 | 76·8 | 574 | 87·0 |
*
Restricted to participants who reported consuming between 2092 and 20 920 kJ/d.
†
Cell counts may not sum to column total because of missing data.