Table 3

 Smoking history of cases and controls

Current smokers (n = 70)Former smokers (n = 71)Ever smoked (n = 141)
Values are mean (SD).
Smoking years before rheumatoid arthritis34.4 (10.8)25.5 (11.4)29.8 (11.9)
Smoking pack ( = 20 cigarettes)9105 (6606)7385 (6455)8285 (6566)
Pack year ( = 20 cigarettes daily for one year) median24.9 (18.0)20.2 (17.7)22.7 (17.9)
Years stopped smoking before rheumatoid arthritis15.7 (8.9)