Associations of tea drinking or green tea drinking with risk of glucose metabolism impaired
| Tea drinking | Green tea drinking | |||
| OR (95% CI) | P value | OR (95% CI) | P value | |
| Tea/green tea drinking | ||||
| Non-drinkers | 1.00 (reference) | 1.00 (reference) | ||
| Drinkers | 1.21 (1.01, 1.44) | 0.034 | 1.25 (1.01, 1.54) | 0.045 |
| Amount of tea consumption (cups/day) | ||||
| <1 | 1.00 (reference) | 1.00 (reference) | ||
| 1–2 | 1.61 (1.23, 2.12) | 0.001 | 1.56 (1.10, 2.20) | 0.012 |
| >2 | 1.11 (0.92, 1.35) | 0.277 | 1.18 (0.92, 1.51) | 0.190 |
| P value for trend | 0.166 | 0.088 | ||
| Tea concentrations | ||||
| Light | 1.00 (reference) | 1.00 (reference) | ||
| Medium | 1.03 (0.78, 1.36) | 0.841 | 1.13 (0.78, 1.65) | 0.512 |
| Strong | 1.76 (1.15, 2.70) | 0.010 | 2.70 (1.40, 5.21) | 0.003 |
| P value for trend | 0.034 | 0.012 | ||
| Duration of tea drinking (years) | ||||
| Non-drinkers | 1.00 (reference) | 1.00 (reference) | ||
| <1 | 0.96 (0.61, 1.51) | 0.853 | 1.05 (0.61, 1.82) | 0.855 |
| 1–5 | 1.20 (0.90, 1.59) | 0.209 | 1.25 (0.84, 1.84) | 0.272 |
| 6–10 | 1.29 (0.91, 1.84) | 0.155 | 1.21 (0.74, 1.98) | 0.437 |
| >10 | 1.27 (1.02, 1.58) | 0.033 | 1.31 (0.99, 1.72) | 0.056 |
| P value for trend | 0.016 | 0.035 | ||
Model adjusted for categorical age, gender, categorical body mass index (BMI), alcohol consumption, coffee drinking, smoking status, education, family history of diabetes, history of dyslipidemia and physical activity at work.