Stratum-specific OR (95% CI) by Charlson index for steroid and NSAID use adjusted for age and gender
| Charlson group 0* | Charlson group 1* | Charlson group 2* | |
| Steroids current | 6.45 (2.92 to 14.21) | 1.96 (0.73 to 5.24) | 1.57 (0.64 to 3.91) |
| Steroids ever | 2.11 (1.42 to 3.12) | 1.68 (1.22 to 2.32) | 1.53 (1.19 to 1.99) |
| NSAID current | 1.48 (0.81 to 2.71) | 1.32 (0.55 to 3.14) | 1.90 (0.89 to 4.06) |
| NSAID ever | 1.69 (1.36 to 2.10) | 1.87 (1.38 to 2.53) | 1.15 (0.90 to 1.50) |
↵* Charlson group indicates comorbidity as scored by the Charlson index grouped into 0, 1 and ≥2.
NSAIDs, non-steroidal anti-inflammatory drugs.