| NAT2 |  |  | |
---|---|---|---|---|
 | Fast | Slow |  |  |
Characteristic | No. (%) | No. (%) | OR | 95% CI |
Age (years) | Â | Â | Â | Â |
   <50a | 22 (12) | 38 (12) | 1.0 | - |
   50 to 59 | 15 (8) | 28 (9) | 1.1 | 0.5 to 2.4 |
   60 to 69 | 59 (32) | 103 (32) | 1.0 | 0.5 to 1.9 |
   70+ | 86 (47) | 151 (47) | 1.0 | 0.6 to 1.8 |
Alcohol use | Â | Â | Â | Â |
   Nondrinkera | 45 (14) | 32 (18) | 1.0 | - |
   ≤ 1 drink/month | 75 (23) | 43 (24) | 1.2 | 0.7 to 2.2 |
   Few drinks/month | 77 (24) | 39 (21) | 1.4 | 0.8 to 2.5 |
   Few drinks/week | 76 (24) | 39 (21) | 1.4 | 0.8 to 2.5 |
   Almost every day | 40 (12) | 24 (13) | 1.2 | 0.6 to 2.3 |
   Unknown | 7 (2) | 5 (3) | 1.0 | 0.3 to 3.4 |
Body mass index (BMI) (kg/m2) | Â | Â | Â | Â |
   <20.0a | 30 (17) | 59 (19) | 1.0 | - |
   20.0 to 24.9 | 114 (65) | 196 (62) | 0.9 | 0.5 to 1.4 |
   25.0 to 29.9 | 24 (14) | 50 (16) | 1.1 | 0.5 to 2.0 |
   30.0+ | 8 (4) | 11 (3) | 0.7 | 0.3 to 1.9 |
First-degree family history of breast cancerb | ||||
   Noa | 140 (78) | 240 (77) | 1.0 | - |
   Yes | 39 (22) | 72 (23) | 1.1 | 0.7 to 1.7 |
Parity | Â | Â | Â | Â |
   Nulliparousa | 72 (23) | 27 (15) | 1.0 | - |
   1 live birth | 22 (7) | 22 (12) | 0.4 | 0.2 to 0.8 |
   2 live births | 56 (17) | 43 (24) | 0.5 | 0.3 to 0.9 |
   3 live births | 70 (22) | 48 (25) | 0.5 | 0.3 to 1.0 |
   4 live births | 46 (14) | 21 (12) | 0.8 | 0.4 to 1.6 |
   5 or more live births | 54 (17) | 21 (12) | 1.0 | 0.5 to 1.9 |
Geographical location | Â | Â | Â | Â |
   Cape Cod, Massachusettsa | 91 (50) | 178 (56) | 1.0 | - |
   Los Angeles, California | 27 (15) | 33 (10) | 0.6 | 0.3 to 1.1 |
   Rhode Island | 17 (9) | 38 (12) | 1.1 | 0.6 to 2.1 |
   Minnesota | 28 (15) | 34 (11) | 0.6 | 0.3 to 1.1 |
   North Carolina | 19 (10) | 37 (12) | 1.0 | 0.5 to 1.8 |
History of benign breast disease | ||||
   Noa | 116 (65) | 206 (65) | 1.0 | - |
   Yes | 63 (35) | 110 (35) | 1.0 | 0.7 to 1.4 |