From: Body mass index and survival after breast cancer diagnosis in Japanese women
 | BMI | Patients | Person-years | All-cause death | Age-adjusted |  | Multivariate-adjusted | ||||
---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  |  |  |  | HR | 95% CI |  | HR | 95% CI |  |
All | |||||||||||
 |  | <21.2 | 163 | 963.0 | 42 | 1.73 | 1.07 - 2.80 |  | 1.60 | 0.97 - 2.63 |  |
 |  | ≥21.2 to <23.3 | 166 | 1052.4 | 27 | 1.00 (reference) |  | 1.00 (reference) a |  | ||
 |  | ≥23.3 to <25.8 | 161 | 1020.1 | 29 | 1.03 | 0.61 - 1.75 |  | 0.88 | 0.51 - 1.51 |  |
 |  | ≥25.8 | 163 | 997.3 | 38 | 1.37 | 0.83 - 2.25 |  | 1.46 | 0.87 - 2.44 |  |
 | p for trend |  |  | 0.35 |  |  | 0.59 | ||||
 | p for trend in women with BMI ≥21.2 |  |  | 0.18 |  |  | 0.11 | ||||
Premenopausal | |||||||||||
 |  | <21.2 | 89 | 556.1 | 18 | 2.04 | 0.88 - 4.69 |  | 1.75 | 0.71 - 4.29 |  |
 |  | ≥21.2 to <23.3 | 73 | 510.2 | 8 | 1.00 (reference) |  | 1.00 (reference) b |  | ||
 |  | ≥23.3 to <25.8 | 63 | 391.6 | 11 | 1.74 | 0.70 - 4.35 |  | 1.61 | 0.63 - 4.11 |  |
 |  | ≥25.8 | 52 | 319.8 | 13 | 2.49 | 1.03 - 6.03 |  | 2.61 | 1.01 - 6.78 |  |
 | p for trend |  |  | 0.52 |  |  | 0.29 | ||||
 | p for trend in women with BMI ≥21.2 |  |  | 0.05 |  |  | 0.059 | ||||
Postmenopausal | |||||||||||
 |  | <21.2 | 67 | 371.6 | 20 | 1.56 | 0.82 - 2.98 |  | 0.93 | 0.47 - 1.86 |  |
 |  | ≥21.2 to <23.3 | 86 | 500.7 | 17 | 1.00 (reference) |  | 1.00 (reference) b |  | ||
 |  | ≥23.3 to <25.8 | 93 | 589.2 | 16 | 0.74 | 0.37 - 1.47 |  | 0.45 | 0.21 - 0.94 |  |
 |  | ≥25.8 | 108 | 670.7 | 22 | 0.93 | 0.49 - 1.75 |  | 0.72 | 0.36 - 1.45 |  |
 | p for trend |  |  | 0.086 |  |  | 0.2 | ||||
 | p for trend in women with BMI ≥21.2 |  |  | 0.91 |  |  | 0.71 | ||||
Pre v Post p for heterogeneity of trends | Â | Â | 0.13 | Â | Â | 0.24 | |||||
Pre v Post p for heterogeneity of trends in women with BMI ≥21.2 |  |  | 0.09 |  |  | 0.11 |