Table 1.
Descriptive Characteristics of Study Participants
| Characteristics | % Difference | n (%) | |
|---|---|---|---|
| Age, y | |||
| Mean ± SD | 36.7 ± 5.2 | 164a | |
| Age groups | |||
| 25–35 y | 62 (38) | ||
| 36–45 y | 102 (62) | ||
| Age at menarche, y | |||
| Mean ± SD | 12.5 ± 1.7 | 147a | |
| Age at first live birth, y | |||
| Mean ± SD | 23.6 ± 6.0 | 107a | |
| Parity | |||
| No children | 49 (31) | ||
| 1 or more children | 107 (69) | ||
| Marital status | |||
| Single | 56 (34) | ||
| Married | 87 (53) | ||
| Other | 21 (13) | ||
| Education | |||
| ≤ High school | 25 (15) | ||
| Some college or technical school | 21 (13) | ||
| ≥ College graduate | 118 (72) | ||
| Current Smoker | |||
| No | 138 (85) | ||
| Yes | 25 (15) | ||
| BMI, kg/m2 | |||
| Mean ± SD | 32.0 ± 8.1 | 150a | |
| BMI categories | |||
| Normal (<25 kg/m2) | 28 (19) | ||
| Overweight (between 25 and 30 kg/m2) | 42 (28) | ||
| Obese (>30 kg/m2) | 80 (53) | ||
| Serum SHBG levels, nmol/L | |||
| GeoMean (95% CI) | 97.1 (88.2, 106.9) | 154a | |
| In categories of WC | |||
| Category 1 (<81.34 cm) | 143.1 (126.3, 162.2) | 37a | |
| Category 2 (81.34–89.80 cm) | 98.6 (81.6, 119.1) | 36.8% | 35a |
| Category 3 (89.80–104.90 cm) | 92.9 (80.2, 107.6) | 42.5% | 36a |
| Category 4 (>104.90 cm) | 63.8 (49.8, 81.7) | 76.7% | 35a |
| In categories of WHR | |||
| Category 1 (<0.74) | 121.3 (103.9, 141.6) | 35a | |
| Category 2 (0.74–0.80) | 106.7 (91.1, 124.9) | 12.8% | 36a |
| Category 3 (0.80–0.86) | 89.8 (74.0, 109.1) | 29.8% | 36a |
| Category 4 (>0.86) | 74.0 (57.0, 96.0) | 48.4% | 36a |
| Serum total estradiol (pg/mL) | |||
| GeoMean (95% CI) | 151.2 (127.9, 178.6) | 135a | |
| In categories of WC | |||
| Category 1 (<81.34 cm) | 135.6 (99.4, 185.1) | 32a | |
| Category 2 (81.34–89.80 cm) | 158.9 (114.0, 221.4) | 15.8% | 30a |
| Category 3 (89.80–104.90 cm) | 151.6 (109.8, 209.4) | 11.4% | 31a |
| Category 4 (>104.90 cm) | 165.9 (119.6, 230.1) | 20.1% | 32a |
| In categories of WHR | |||
| Category 1 (<0.74) | 108.4 (72.8, 161.3) | 31a | |
| Category 2 (0.74–0.80) | 142.7 (105.5, 193.2) | 27.3% | 29a |
| Category 3 (0.80–0.86) | 213.2 (165.8, 274.1) | 65.2% | 31a |
| Category 4 (> 0.86) | 162.3 (122.0, 216.0) | 39.8% | 34a |
Abbreviations: CI, confidence interval; GeoMean, geometric mean.
a
Number of responses used to compute summary statistics. “Other” category consists of participants who were divorced, separated, or widowed. Women were excluded from the study if they reported oral contraceptive use or anovulatory cycles.