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Table 4 Odds ratios for the risk of developing rheumatoid arthritis according to two sensitivity analyses

From: Is tea consumption associated with reduction of risk of rheumatoid arthritis? A Swedish case-control study

  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)
  1. ±The model was adjusted for coffee consumption, smoking status, alcohol, body mass index, and educational level, in addition to the matching factors (age, sex, and residential area)