Risk for breast cancer and socioeconomic and reproductive variables in Mexican women
| Risk factor . | All women (n = 1,866) . | . | . | Premenopausal women (n = 875) . | . | . | Postmenopausal women (n = 991) . | . | . | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | Control (n = 1,391) . | Cases (n = 475) . | OR* (95% CI) . | Control (n = 699) . | Cases (n = 226) . | OR* (95% CI) . | Control (n = 692) . | Cases (n = 249) . | OR* (95% CI) . | |||||||||
| SES | ||||||||||||||||||
| Low | 423 | 130 | 1.00 | 191 | 69 | 1.00 | 232 | 61 | 1.00 | |||||||||
| Middle | 695 | 201 | 0.89 (0.69-1.15) | 356 | 67 | 0.49 (0.33-0.74) | 339 | 134 | 1.39 (0.98-1.98) | |||||||||
| High | 273 | 144 | 1.58 (1.17-2.12) | 139 | 53 | 1.04 (0.66-1.66) | 134 | 91 | 2.22 (1.48-3.31) | |||||||||
| P for trend | 0.005 | 0.503 | 0.000 | |||||||||||||||
| Familial breast cancer | ||||||||||||||||||
| No | 1,365 | 456 | 1.00 | 677 | 178 | 1.00 | 688 | 278 | 1.00 | |||||||||
| Yes | 26 | 19 | 1.95 (1.05-3.63) | 9 | 11 | 4.18 (1.60-10.90) | 17 | 8 | 1.07 (0.43-2.62) | |||||||||
| Menopausal status | ||||||||||||||||||
| Premenopausal | 686 | 189 | 1.00 | |||||||||||||||
| Postmenopausal | 705 | 286 | 0.71 (0.49-1.03) | |||||||||||||||
| Age (y) at first birth† | ||||||||||||||||||
| <20 | 541 | 139 | 1.00 | 268 | 62 | 1.00 | 273 | 77 | 1.00 | |||||||||
| 20-29 | 613 | 219 | 1.35 (1.05-1.73) | 336 | 89 | 1.10 (0.75-1.60) | 277 | 130 | 1.58 (1.13-2.21) | |||||||||
| >29 | 67 | 82 | 1.61 (1.01-2.56) | 29 | 9 | 0.95 (0.41-2.20) | 38 | 26 | 2.01 (1.13-3.58) | |||||||||
| Nulliparous | 161 | 81 | 1.64 (1.17-2.30) | 48 | 29 | 2.26 (1.28-3.96) | 113 | 52 | 1.48 (0.96-2.26) | |||||||||
| Missing | 9 | 1 | — | 5 | 0 | — | 4 | 1 | — | |||||||||
| P for trend | 0.11 | 0.48 | 0.02 | |||||||||||||||
| Parity | ||||||||||||||||||
| 0 | 161 | 81 | 1.00 | 48 | 29 | 1.00 | 113 | 52 | 1.00 | |||||||||
| 1-2 | 265 | 103 | 0.93 (0.64-1.36) | 189 | 50 | 0.58 (0.32-1.06) | 76 | 53 | 1.39 (0.85-2.29) | |||||||||
| 3-4 | 399 | 132 | 0.83 (0.59-1.19) | 263 | 60 | 0.44 (0.25-0.77) | 136 | 72 | 1.18 (0.75-1.86) | |||||||||
| ≥5 | 566 | 159 | 0.61 (0.44-0.85) | 186 | 50 | 0.40 (0.22-0.73) | 380 | 109 | 0.69 (0.46-1.03) | |||||||||
| P for trend | <0.001 | <0.001 | <0.001 | |||||||||||||||
| Risk factor . | All women (n = 1,866) . | . | . | Premenopausal women (n = 875) . | . | . | Postmenopausal women (n = 991) . | . | . | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | Control (n = 1,391) . | Cases (n = 475) . | OR* (95% CI) . | Control (n = 699) . | Cases (n = 226) . | OR* (95% CI) . | Control (n = 692) . | Cases (n = 249) . | OR* (95% CI) . | |||||||||
| SES | ||||||||||||||||||
| Low | 423 | 130 | 1.00 | 191 | 69 | 1.00 | 232 | 61 | 1.00 | |||||||||
| Middle | 695 | 201 | 0.89 (0.69-1.15) | 356 | 67 | 0.49 (0.33-0.74) | 339 | 134 | 1.39 (0.98-1.98) | |||||||||
| High | 273 | 144 | 1.58 (1.17-2.12) | 139 | 53 | 1.04 (0.66-1.66) | 134 | 91 | 2.22 (1.48-3.31) | |||||||||
| P for trend | 0.005 | 0.503 | 0.000 | |||||||||||||||
| Familial breast cancer | ||||||||||||||||||
| No | 1,365 | 456 | 1.00 | 677 | 178 | 1.00 | 688 | 278 | 1.00 | |||||||||
| Yes | 26 | 19 | 1.95 (1.05-3.63) | 9 | 11 | 4.18 (1.60-10.90) | 17 | 8 | 1.07 (0.43-2.62) | |||||||||
| Menopausal status | ||||||||||||||||||
| Premenopausal | 686 | 189 | 1.00 | |||||||||||||||
| Postmenopausal | 705 | 286 | 0.71 (0.49-1.03) | |||||||||||||||
| Age (y) at first birth† | ||||||||||||||||||
| <20 | 541 | 139 | 1.00 | 268 | 62 | 1.00 | 273 | 77 | 1.00 | |||||||||
| 20-29 | 613 | 219 | 1.35 (1.05-1.73) | 336 | 89 | 1.10 (0.75-1.60) | 277 | 130 | 1.58 (1.13-2.21) | |||||||||
| >29 | 67 | 82 | 1.61 (1.01-2.56) | 29 | 9 | 0.95 (0.41-2.20) | 38 | 26 | 2.01 (1.13-3.58) | |||||||||
| Nulliparous | 161 | 81 | 1.64 (1.17-2.30) | 48 | 29 | 2.26 (1.28-3.96) | 113 | 52 | 1.48 (0.96-2.26) | |||||||||
| Missing | 9 | 1 | — | 5 | 0 | — | 4 | 1 | — | |||||||||
| P for trend | 0.11 | 0.48 | 0.02 | |||||||||||||||
| Parity | ||||||||||||||||||
| 0 | 161 | 81 | 1.00 | 48 | 29 | 1.00 | 113 | 52 | 1.00 | |||||||||
| 1-2 | 265 | 103 | 0.93 (0.64-1.36) | 189 | 50 | 0.58 (0.32-1.06) | 76 | 53 | 1.39 (0.85-2.29) | |||||||||
| 3-4 | 399 | 132 | 0.83 (0.59-1.19) | 263 | 60 | 0.44 (0.25-0.77) | 136 | 72 | 1.18 (0.75-1.86) | |||||||||
| ≥5 | 566 | 159 | 0.61 (0.44-0.85) | 186 | 50 | 0.40 (0.22-0.73) | 380 | 109 | 0.69 (0.46-1.03) | |||||||||
| P for trend | <0.001 | <0.001 | <0.001 | |||||||||||||||