Smoking history: |
(1) Current | 14 | (10.61) | | 41 | (21.35) | | 0.437 (0.228–0.839) | 0.013 | | 0.514 (0.262–1.01) | 0.054 |
Non-smoker | 118 | (89.39) | | 151 | (78.65) | | 1 | | | | |
(2) Ex-smoker | 83 | (41.29) | | 121 | (44.49) | | 0.878 (0.607–1.27) | 0.489 | | 0.907 (0.618–1.33) | 0.621 |
Non-smoker | 118 | (58.71) | | 151 | (55.51) | | 1 | | | | |
Number of years exposed to pesticide: | | | | | | | 1.05 (1.01–1.09) | 0.018 | | 1.05 (0.992–1.11) | 0.090 |
Tea (cups per day) |
<1 | 102 | (47.44) | | 117 | (37.38) | | 1.51 (1.06–2.15) | 0.021 | | 1.35 (0.931–1.95) | 0.114 |
⩾1 | 113 | (52.56) | | 196 | (62.62) | | 1 | | | | |
Family history: |
History | 7 | (3.26) | | 2 | (0.64) | | 5.21 (1.07–25.3) | 0.041 | | 4.04 (0.802–20.4) | 0.091 |
No history | 208 | (96.74) | | 311 | (99.36) | | 1 | | | | |
Pesticide exposure in farming: |
Pesticide | 19 | (8.84) | | 16 | (5.11) | | 1.80 (0.903–3.58) | 0.095 | | 0.754 (0.257–2.22) | 0.608 |
No pesticide | 196 | (91.16) | | 297 | (94.89) | | 1 | | | | |
Percentage of stay in rural area | | | | | | | 1.01 (0.999–1.01) | 0.122 | | 1.00 (0.995–1.01) | 0.408 |
Vitamin or cod liver oil supplement (times/week): |
<1 | 184 | (85.58) | | 280 | (89.46) | | 0.700 (0.414–1.18) | 0.182 | | 0.685 (0.396–1.19) | 0.178 |
⩾1 | 31 | (14.42) | | 33 | (10.54) | | 1 | | | | |
Consume raw vegetables (times/week): |
<1 | 210 | (97.67) | | 309 | (98.72) | | 0.544 (0.144–2.05) | 0.368 | | 0.577 (0.149–2.23) | 0.426 |
⩾1 | 5 | (2.33) | | 4 | (1.28) | | 1 | | | | |
Fruit consumption (times per week): |
<1 | 11 | (5.12) | | 19 | (6.07) | | 0.834 (0.389–1.79) | 0.642 | | 0.850 (0.383–1.89) | 0.689 |
⩾1 | 204 | (94.88) | | 294 | (93.93) | | 1 | | | | |
Vegetable consumption (times/week): |
<1 | 2 | (0.93) | | 2 | (0.64) | | 1.46 (0.204–10.4) | 0.706 | | 1.58 (0.215–11.6) | 0.655 |
⩾1 | 213 | (99.07) | | 311 | (99.36) | | 1 | | | | |
Drinking well water: |
| 134 | (62.33) | | 193 | (61.66) | | 1.03 (0.719–1.47) | 0.877 | | 1.04 (0.701–1.54) | 0.850 |
| 81 | (37.67) | | 120 | (38.34) | | | | | | |
Farming: |
| 84 | (39.07) | | 124 | (39.62) | | 0.977 (0.685–1.39) | 0.900 | | 0.919 (0.592–1.43) | 0.709 |
| 131 | (60.93) | | 189 | (60.38) | | | | | | |