Stratification of patients with RA and controls according to the median CAG repeat length of shorter AR allele, longer AR allele, and their mean.
| RA, n = 325 n (%) | Controls, n = 238 n (%) | Subjects Compared | p* | OR (95% CI) | |
|---|---|---|---|---|---|
| CAG repeats in shorter allele | |||||
| ≤ 20 CAG | 164 (50.5) | 123 (51.7) | > 20 vs ≤ 20 | 0.80 | 1.05 (0.75–1.47) |
| > 20 CAG | 161 (49.5) | 115 (48.3) | |||
| CAG repeats in longer allele | |||||
| ≤ 23 CAG | 152 (46.8) | 122 (51.3) | > 23 vs ≤ 23 | 0.31 | 1.20 (0.86–1.67) |
| > 23 CAG | 173 (53.2) | 116 (48.7) | |||
| Mean of CAG repeats in shorter and longer alleles | |||||
| ≤ 22 CAG | 172 (52.9) | 136 (57.1) | > 22 vs ≤ 22 | 0.35 | 1.19 (0.85–1.66) |
| > 22 CAG | 153 (47.1) | 102 (42.9) | |||
↵* Fisher’s exact test. RA: rheumatoid arthritis.