Effects of cigarette smoking on RA radiographic severity assessed by the Larsen method†
| Number of subjects (%)*with categorised average Larsen damage score (DS)† | ||||
|
Stratum 1‡
DS <1 |
Stratum 2 1.1 < DS <14 |
Stratum 3 14.1 < DS <27 |
Stratum 4 27.1 < DS | |
| Smoking status | ||||
| Never smoked | 34 (32) | 20 (19) | 25 (24) | 27 (25) |
| Ever smoked | 20 (18) | 34 (32) | 26 (25) | 26 (25) |
| Odds ratio (95% CI)‡ | 1.0 (Referent) | 2.9 (1.3,6.2) | 1.8 (0.8,3.8) | 1.6 (0.8,3.5) |
CI=Confidence intervals. *n=212 subjects. †Larsen damage score based on the mean of three radiographic readings (scored from 0 to 100). ‡Referent to stratum 1; stratums determined based on quartiles.