Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Subgroup analysis for the risk of RA associated with COPD.
| Subgroups | Included studies | OR (95% CI) |
Heterogeneity | |
|---|---|---|---|---|
| I2 (%) | P value | |||
| Gender | ||||
| Female | 2 | 1.96 (1.37, 2.81) | 0.0 | 0.000 |
| Male | 2 | 0.94 (0.56, 1.59) | 0.0 | 0.829 |
| Serum reactivity | ||||
| Seropositive RA | 4 | 1.65 (1.24, 2.19) | 4.6 | 0.001 |
| Seronegative RA | 4 | 1.70 (1.23, 2.36) | 0.0 | 0.001 |
| Study type | ||||
| Case-control study | 5 | 1.24 (0.10, 1.52) | 21.6 | 0.051 |
| Cohort study | 3 | 1.74 (1.50, 1.99) | 28.6 | 0.000 |
| Cross-sectional study | 1 | 0.92 (0.40, 2.12) | – | 0.845 |
