Table 4.
Association of timing of supper and sleep interval on risk of breast and prostate cancer by chronotype
| Chronotype | Controls for breast cancer cases N (%) | Breast cancer cases N (%) | OR (95%CI)a | Controls for prostate cancer cases N (%) | Prostate cancer cases N (%) | OR (95%CI)b | Combined breast and prostate cancer OR (95%CI) |
|---|---|---|---|---|---|---|---|
| Morning type | |||||||
| 1 hr or less (ref) | 83 (19.4) | 92 (24.7) | 114 (41.0) | 96 (48.2) | |||
| From >1 to ≤2 hr | 183 (42.9) | 166 (44.5) | 0.84 (0.58,1.21) | 99 (35.6) | 66 (33.2) | 0.76 (0.50,1.17) | 0.80 (0.61,1.06) |
| More than 2 hr | 161 (37.7) | 115 (30.8) | 0.65 (0.44,0.97) | 65 (23.4) | 37 (18.6) | 0.67 (0.41,1.10) | 0.66 (0.49,0.90) |
| Intermediate Type | |||||||
| 1 hr or less (ref) | 81 (17.7) | 72 (17.7) | 91 (34.5) | 85 (42.5) | |||
| From >1 to ≤2 hr | 172 (37.6) | 173 (42.6) | 1.10 (0.75,1.62) | 118 (44.7) | 72 (36.0) | 0.65 (0.42,1.00) | 0.85 (0.51,1.43) |
| More than 2 hr | 205 (44.8) | 161 (39.7) | 0.84 (0.57,1.23) | 55 (20.8) | 43 (21.5) | 0.87 (0.52,1.45) | 0.85 (0.62,1.16) |
| Evening type | |||||||
| 1 hr or less (ref) | 68 (18.7) | 65 (17.6) | 94 (34.1) | 71 (36.4) | |||
| From >1 to ≤2 hr | 136 (37.4) | 139 (37.7) | 1.05 (0.69,1.60) | 98 (35.5) | 76 (39.0) | 1.02 (0.65,1.59) | 1.03 (0.76,1.40) |
| More than 2 hr | 160 (44.0) | 165 (44.7) | 1.06 (0.70,1.60) | 84 (30.4) | 48 (24.6) | 0.74 (0.45,1.21) | 0.86 (0.57,1.30) |
a
Adjusted for age, educational level, menopausal status and center.
b
Adjusted for age, educational level and center.