Table 1. Selected characteristics according to categories of BMI at diagnosis in the Kaiser Permanente Northern California population (N=3,408).
| BMI at diagnosis (kg/m2) – WHO categories | |||||
|---|---|---|---|---|---|
|
| |||||
| <18.5 | 18.5-<25 | 25-<30 | 30-<35 | >=35 | |
| N | 67 | 1,050 | 1,214 | 671 | 408 |
| N, pre-diagnosis BMI | 45 | 729 | 823 | 461 | 287 |
| N, post-diagnosis BMI | 50 | 974 | 1,141 | 623 | 369 |
| Age at diagnosis | 65 | 64 | 63 | 62 | 60 |
| Mean pre-diagnosis BMI | 18.5 | 23.6 | 28.1 | 32.8 | 40.7 |
| Mean BMI at diagnosis | 17.4 | 22.6 | 27.4 | 32.1 | 40.4 |
| Female (%) | 77.3 | 58.3 | 40.4 | 44.6 | 58.7 |
| Race | |||||
| White | 57.4 | 62.5 | 65.1 | 69.0 | 70.0 |
| Black | 8.8 | 5.8 | 6.4 | 8.5 | 10.6 |
| Hispanic | 2.9 | 6.8 | 12.4 | 15.3 | 13.0 |
| Asian/Pacific Islander | 30.9 | 24.6 | 15.5 | 6.7 | 4.7 |
| Stage | |||||
| I | 26.5 | 28.4 | 30.7 | 31.3 | 31.4 |
| II | 38.2 | 33.5 | 33.2 | 27.3 | 28.7 |
| III | 35.3 | 38.2 | 36.1 | 41.3 | 40.0 |
| Grade | |||||
| I | 2.9 | 7.0 | 7.6 | 7.2 | 7.4 |
| II | 75.5 | 75.4 | 75.9 | 74.5 | 75.0 |
| III | 16.2 | 11.1 | 10.2 | 11.0 | 11.5 |
| IV | 1.5 | 1.8 | 1.2 | 1.6 | 1.0 |
| Unknown | 5.9 | 4.7 | 5.1 | 5.7 | 5.2 |
| Site | |||||
| Proximal | 52.9 | 46.3 | 43.2 | 42.8 | 47.1 |
| Distal | 17.7 | 24.4 | 27.2 | 28.7 | 29.4 |
| Rectal | 29.4 | 29.3 | 29.6 | 28.5 | 23.5 |
| Treatment | |||||
| Chemotherapy | 38.5 | 45.6 | 44.0 | 45.7 | 40.5 |
| Radiation | 15.9 | 16.0 | 16.1 | 14.6 | 10.2 |
| Physical activity (min/wk) | |||||
| 0 | 33.3 | 24.0 | 24.4 | 34.2 | 46.2 |
| >0-<120 | 22.2 | 31.3 | 34.6 | 34.2 | 36.9 |
| ≥120 | 44.4 | 44.6 | 41.0 | 31.5 | 17.9 |
| Smoking status | |||||
| Never | 37.3 | 48.4 | 47.0 | 43.8 | 46.6 |
| Past | 43.3 | 37.3 | 42.3 | 45.0 | 42.1 |
| Current | 19.4 | 14.3 | 10.8 | 11.0 | 10.8 |