RF–anti-CCP2– (n = 8836) | RF+anti-CCP2– (n = 572) | RF–anti-CCP2+ (n = 125) | RF+anti-CCP2+ (n = 42) | |
---|---|---|---|---|
Smoking ever (%) | 3117 (35.3) | 178 (31.1) | 39 (31.2) | 22 (52.4) |
Smoking never (%) | 5719 (64.7) | 394 (68.9) | 86 (68.8) | 20 (47.6) |
Odds ratio (95% CI) | 1 (reference) | 0.94 (0.75–1.18) | 0.97 (0.6–1.58) | 2.95 (1.32–6.58)* |
p value | – | 0.23 | 0.48 | <0.001* |