Table 3 Adjusted odds ratios for green tea intake by hospital and population controls
From: Population versus hospital controls for case-control studies on cancers in Chinese hospitals
No. cases/hospital controls | Adjusted ORa (95% CI) | No. cases/population controls | Adjusted ORa (95% CI) | |
|---|---|---|---|---|
All cancer cases | ||||
Frequency of green tea drinking | ||||
Never or seldom | 353/363 | 1.00b | 353/362 | 1.00 |
≥ 1 times per day | 72/124 | 0.77 (0.59, 1.00) | 72/120 | 0.78 (0.60, 1.01) |
Dried green tea leaves (g/year) | ||||
0 | 353/363 | 1.00 | 353/362 | 1.00 |
500- < 1000 | 24/66 | 0.60 (0.40, 0.92) | 24/50 | 0.71 (0.47, 1.08) |
≥ 1000 | 17/59 | 0.51 (0.31, 0.83) | 17/67 | 0.21 (0.27, 0.74) |
Breast cancer only c | ||||
Frequency of green tea drinking | ||||
Never or seldom | 199/211 | 1.00 | 199/226 | 1.00 |
≥ 1 times per day | 25/49 | 0.55 (0.28, 1.06) | 25/37 | 0.61 (0.32, 1.18) |
Dried green tea leaves (g/year) | ||||
0 | 199/211 | 1.00 | 199/226 | 1.00 |
500- < 1000 | 14/28 | 0.54 (0.22, 1.33) | 14/20 | 0.60 (0.24, 1.50) |
≥ 1000 | 3/16 | 0.06 (0.01, 0.61) | 3/15 | 0.07 (0.01, 0.47) |
Colorectal cancer only | ||||
Frequency of green tea drinking | ||||
Never or seldom | 140/132 | 1.00 | 140/111 | 1.00 |
≥ 1 times per day | 35/65 | 0.67 (0.45, 0.99) | 35/72 | 0.62 (0.42, 0.92) |
Dried green tea leaves (g/year) | ||||
0 | 140/132 | 1.00 | 140/111 | 1.00 |
500- < 1000 | 10/29 | 0.51 (0.26, 0.99) | 10/27 | 0.55 (0.28, 1.06) |
≥ 1000 | 13/39 | 0.52 (0.29, 0.94) | 13/46 | 0.45 (0.25, 0.82) |
Leukemia only | ||||
Frequency of green tea drinking | ||||
Never or seldom | 14/20 | 1.00 | 14/25 | 1.00 |
≥ 1 times per day | 12/10 | 1.46 (0.55, 3.84) | 12/11 | 1.55 (0.61, 3.96) |
Dried green tea leaves (g/year) | ||||
0 | 14/20 | 1.00 | 14/25 | 1.00 |
500- < 1000 | 0/9 | - | 0/3 | - |
≥ 1000 | 1/4 | 0.65 (0.08, 5.63) | 1/6 | 0.57 (0.07, 4.79) |