Change in body mass index(BMI) for participants with smoking data classified by BMI at each survey
| BMI at first survey kg·m-2 | BMI at second survey kg·m-2 | Total | |||
| <20 | 20–<25 | 25–<30 | ≥30 | ||
| <20 | 493 (0.36±0.83) | 737 (2.29±1.30) | 27 (6.84±1.01) | 2 (11.00±0.07) | 1259 (1.65±1.70) |
| 20–<25 | 126 (-1.96±1.44) | 3425 (0.92±1.29) | 1797 (3.20±1.53) | 108 (8.35±4.79) | 5456 (1.75±2.15) |
| 25–<30 | 3 (-6.79±1.15) | 169 (-2.09±1.28) | 1469 (1.08±1.45) | 642 (4.46±2.36) | 2283 (1.79±2.56) |
| ≥30 | 0 | 10 (-9.75±8.54) | 50 (-2.57±1.73) | 494 (2.84±3.48) | 554 (2.13±4.16) |
| Total | 622 (-0.14±1.43) | 4341 (1.01±1.65) | 3343 (2.21±1.96) | 1246 (4.17±3.46) | 9552 (1.77±2.37) |
Data are presented as n (mean±sd).