Table 3 Odds ratios (OR) for coffee consumption and risk of developing RA among 2184 newly diagnosed RA cases and 4201 controls, matched on age, sex, and residential area, according to sensitivity analyses
From: Investigation of the association between coffee and risk of RA—results from the Swedish EIRA study
Coffee, cups/day | < 2 cups/day | 2–< 4 cup/day | 4–< 6 cups/day | ≥ 6 cups/day | |
|---|---|---|---|---|---|
Removing missing coffee data | |||||
N cases/controls | 329/643 | 947/1874 | 483/907 | 183/256 | |
Crude OR | Ref | 1.00 (0.85–1.17) | 1.10 (0.91–1.32) | 1.45 (1.13–1.85) | |
OR adjusted for smoking | Ref | 0.93 (0.79–1.09) | 0.92 (0.76–1.12) | 1.11 (0.86–1.44) | |
Full modela | Ref | 0.92 (0.77–1.09) | 0.91 (0.75–1.12) | 1.06 (0.81–1.39) | |
Changing reference group | |||||
0 cups/day | > 0–< 2 cups/day | 2–< 4 cup/day | 4–< 6 cups/day | ≥ 6 cups/day | |
N cases/controls | 252/544 | 319/620 | 947/1874 | 483/907 | 183/256 |
Crude OR | Ref | 1.13 (0.92–1.38) | 1.11 (0.93–1.32) | 1.18 (0.97–1.44) | 1.60 (1.24–2.06) |
OR adjusted for smoking | Ref | 1.12 (0.91–1.38) | 1.04 (0.87–1.24) | 1.00 (0.82–1.22) | 1.23 (0.95–1.60) |
Full modela | Ref | 1.17 (0.941–45) | 1.08 (0.89–1.30) | 1.03 (0.83–1.27) | 1.24 (0.94–1.63) |