Table 1.
Patient Demographics and Characteristics.
| Never (N = 2678) | Prior (N = 1558) | Current (N = 932) | Quit (N = 259) | |
|---|---|---|---|---|
| Age, mean (SD) | 51.5 (18.3) | 59.3 (14.8) | 45.2 (13.3) | 46.9 (13.5) |
| Female | 1626 | 781 | 451 | 109 |
| Male | 1052 | 777 | 481 | 150 |
| BMI | 28.6 (6.3) | 29.6 (6.7) | 27.2 (6.5) | 27.6 (6.9) |
| ODI | 29.7 (17.3) | 39.1 (17.6) | 39.1 (18.1) | 36.9 (18.1) |
Abbreviations: Never, patients who never smoked; Prior, smokers who quit prior to their baseline examination; Current, smokers who kept on smoking until their last visit; Quit, smokers who quit during the study; BMI, body mass index; ODI, Oswestry Disability Index; SD, standard deviation.