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Subgroup analysis for the risk of COPD related to RA.
| Subgroups | Included studies | OR (95% CI) |
Heterogeneity | |
|---|---|---|---|---|
| I2 (%) | P value | |||
| Gender | ||||
| Female | 5 | 1.74 (1.59, 1.90) | 0.0 | 0.000 |
| Male | 3 | 1.57 (1.15, 2.14) | 69.5 | 0.004 |
| Serum reactivity | ||||
| Seropositive RA | 3 | 2.09 (1.69, 2.57) | 51.4 | 0.000 |
| Seronegative RA | 3 | 1.58 (1.21, 2.06) | 50.8 | 0.001 |
| Study type | ||||
| Cohort study | 7 | 1.77 (1.60, 1.97) | 71.8 | 0.000 |
| Cross-sectional study | 3 | 0.81 (0.28, 2.36) | 96.4 | 0.706 |
| Case-control study | 2 | 1.43 (1.17, 1.75) | 20.0 | 0.028 |
