Comparison of cases and controls by selected demographic and risk factors among postmenopausal Iowa women
| Subjects who completed survey | Subjects who provided a blood sample | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cases (n = 273) | Controls (n = 657) | OR (95% CI) | Cases (n = 156) | Controls (n = 332) | OR (95% CI) | |||||
| Age, ≥64 yr | 92 | 189 | 1.26 (0.93–1.70) | 46 | 83 | 1.26 (0.82–1.92) | ||||
| High school education or higher | 128 | 277 | 1.21 (0.91–1.61) | 81 | 153 | 1.26 (0.86–1.85) | ||||
| First-degree relatives with breast cancer | 47 | 68 | 1.80 (1.21–2.69) | 26 | 38 | 1.55 (0.90–2.66) | ||||
| Ever used estrogen | 125 | 251 | 1.37 (1.03–1.83) | 66 | 143 | 0.97 (0.66–1.21) | ||||
| Waist:hip ratio of ≥0.77 | 211 | 498 | 1.09 (0.78–1.52) | 116 | 262 | 0.78 (0.50–1.42) | ||||
| Menarche at ≤12 yr | 106 | 278 | 0.87 (0.65–1.16) | 61 | 149 | 0.79 (0.54–1.16) | ||||
| Menopause at ≥52 yr | 87 | 216 | 0.96 (0.71–1.29) | 47 | 106 | 0.92 (0.61–1.39) | ||||
| First live birth at ≥25 yr | 70 | 176 | 0.94 (0.68–1.30) | 45 | 88 | 1.12 (0.74–1.72) | ||||
| Consumed ≥2.6 g of alcohol per day | 70 | 166 | 1.02 (0.74–1.41) | 40 | 84 | 1.02 (0.66–1.58) | ||||
| Ever smoker | 90 | 198 | 1.14 (0.84–1.54) | 51 | 98 | 1.17 (0.78–1.76) | ||||
| Quit >10 yr ago | 40 | 72 | 1.40 (0.92–2.13) | 24 | 32 | 1.67 (0.94–2.98) | ||||
| 1–14 cigarettes/day or smoked <25 yr | 14 | 40 | 0.88 (0.47–1.66) | 9 | 15 | 1.34 (0.57–3.15) | ||||
| 15 cigarettes/day and smoked >25 yr | 36 | 85 | 1.07 (0.70–1.63) | 18 | 51 | 0.79 (0.44–1.41) | ||||
| Red meat intake | ||||||||||
| 2nd highest vs. lowest tertile | 83 | 217 | 1.01 (0.70–1.44) | 50 | 111 | 0.97 (0.60–1.59) | ||||
| Highest vs. lowest tertile | 108 | 224 | 1.27 (0.90–1.79) | 62 | 126 | 1.06 (0.67–1.70) | ||||
| Consistently ate meats well done | 80 | 143 | 1.53 (1.10–2.12) | 44 | 75 | 1.36 (0.88–2.12) | ||||