Table 3. Tea consumption and the risk of oral cancer stratified by milk drinking status.
| Variables | Milk drinking | Non-milk drinking | ||
|---|---|---|---|---|
| Cases/Controls | OR(95%CI)a | Cases/Controls | OR(95%CI)a | |
| Tea consumption | ||||
| No | 139/534 | 1.00 | 206/533 | 1.00 |
| Yes | 28/179 | 0.62(0.39-0.98) | 48/152 | 0.81(0.55-1.19) |
| Duration of tea consumption (years) | ||||
| No | 139/534 | 1.00 | 206/533 | 1.00 |
| <20 | 10/100 | 0.42(0.21-0.84) | 21/69 | 0.72(0.42-1.24) |
| ≥20 | 18/79 | 0.84(0.48-1.48) | 27/83 | 0.89(0.55-1.44) |
| Quantity of tea consumed (ml/day) | ||||
| No | 139/534 | 1.00 | 206/533 | 1.00 |
| <500 | 13/104 | 0.49(0.27-0.92) | 26/77 | 0.85(0.52-1.38) |
| ≥500 | 15/75 | 0.79(0.43-1.46) | 22/75 | 0.77(0.46-1.31) |
| Concentration of tea consumed | ||||
| No | 139/534 | 1.00 | 206/533 | 1.00 |
| Weak | 10/75 | 0.48(0.24-0.98) | 17/54 | 0.78(0.44-1.40) |
| Moderate | 15/88 | 0.68(0.38-1.23) | 21/75 | 0.77(0.46-1.29) |
| Strong | 3/16 | 0.73(0.21-2.56) | 10/23 | 1.15(0.54-2.48) |
| Types of tea | ||||
| No | 139/535 | 1.00 | 206/534 | 1.00 |
| Green tea | 14/100 | 0.55(0.30-0.99) | 26/76 | 0.91(0.56-1.48) |
| Oolong tea | 9/41 | 0.90(0.42-1.96) | 13/43 | 0.76(0.40-1.47) |
| Others | 5/37 | 0.47(0.18-1.25) | 9/32 | 0.77(0.36-1.66) |
aORs were adjusted for age(y), gender, education level, marital status, residence, body mass index and denture wearing.