Frequency table for arthritis development in subgroups of smoking and body mass index (BMI)
| Never smoker | Ever smoker | |||
|---|---|---|---|---|
| BMI<25 kg/m2 (N=10) | BMI≥25 kg/m2 (N=10) | BMI<25 kg/m2 (N=14) | BMI≥25 kg/m2 (N=21) | |
| Follow-up time, months, median (IQR) | 40 (24–71) | 28 (17–51) | 23 (17–41) | 26 (9–42) |
| Arthritis developed, n (%) | 0 (0) | 1 (10) | 2 (14) | 12 (57) |