Table 1.
Baseline Characteristics of Study Participants (N=3,526).
| Infertility | Control | p-value | |
|---|---|---|---|
| N=364 | N=3162 | ||
| Age, mean ± SD (years) | 35.28 ± 7.05 | 30.95 ± 8.08 | <0.001 |
| Ratio of family income to poverty | 2.80 ± 1.63 | 2.61 ± 1.65 | 0.033 |
| Race (%) | 0.080 | ||
| Mexican American | 10.65 | 12.19 | |
| Other Hispanic | 6.09 | 8.14 | |
| Non-Hispanic White | 62.46 | 55.13 | |
| Non-Hispanic Black | 12.18 | 13.55 | |
| Other Race - Including Multi-Racial | 8.61 | 10.98 | |
| Education lever (%) | 0.774 | ||
| Less than high school | 10.73 | 11.59 | |
| High school | 20.03 | 19.11 | |
| More than high school | 69.24 | 69.30 | |
| Marital status (%) | <0.001 | ||
| Married or living with partner | 77.26 | 57.46 | |
| Living alone | 22.74 | 42.54 | |
| Smoked at least 100 cigarettes (%) | <0.001 | ||
| Yes | 36.75 | 29.76 | |
| No | 61.25 | 70.24 | |
| Had at least 12 alcohol drinks/1 year (%) | 0.361 | ||
| Yes | 79.17 | 77.14 | |
| No | 20.83 | 22.86 | |
| Age when first menstrual period occurred (%) | 0.012 | ||
| Age<10 | 7.69 | 4.24 | |
| 10≤Age<15 | 79.40 | 82.70 | |
| 15≤Age ≤ 20 | 12.91 | 13.06 | |
| Had regular periods in past 12 months | 0.007 | ||
| Yes | 84.77 | 89.31 | |
| No | 15.23 | 10.69 | |
| Ever treated for a pelvic infection/PID (%) | <0.001 | ||
| Yes | 9.14 | 3.98 | |
| No | 90.86 | 96.02 | |
| Ever taken birth control pills (%) | 0.014 | ||
| Yes | 78.63 | 70.88 | |
| No | 21.37 | 29.22 | |
| Body Mass Index (kg/m2) | 31.91 ± 9.08 | 28.80 ± 7.96 | <0.001 |
| Waist circumference (cm) | 103.22 ± 20.25 | 94.28 ± 18.07 | <0.001 |
| Weight (kg) | 85.71 ± 26.06 | 76.20 ± 22.10 | <0.001 |
| A Body Shape Index | 80.98 ± 4.65 | 79.32 ± 4.48 | <0.001 |
| Weight-adjusted-waist index | 11.21 ± 0.79 | 10.85 ± 0.81 | <0.001 |