Table 4 Odds ratios for the risk of developing rheumatoid arthritis according to two sensitivity analyses
No consumption (0 cups/day) | Irregular consumption (< 1 cup/day) | Regular consumption (1–2 cups/day) | High consumption (≥2 cups/day) | |
|---|---|---|---|---|
Complete case analysis | ||||
Number cases/controls | 41/61 | 453/847 | 388/845 | 441/1028 |
OR adjusted± | 1.26 (0.82–1.92) | Ref | 0.87 (0.73–1.03) | 0.83 (0.70–0.98) |
Random allocation of missing (70% null category, 10% in each of the others) | ||||
Number cases/controls | 687/1369 | 551/1046 | 473/1022 | 526/1224 |
OR adjusted± | 0.88 (0.76–1.02) | Ref | 0.89 (0.76–1.04) | 0.85 (0.73–0.99) |