Table 1 Description of the sample – the baseline (1994) compared to follow-up (2002).
Baseline-sample | Follow-up-sample | |
|---|---|---|
Responders, n (%) | 9,609 (84%) | 6,554 (57% of the original sample, 68% of the baseline sample) |
Age at baseline, mean (range) | 17.26 (11–22) | 17.38 (11–22) |
Female/male, n (%) | 4,940 (51%) / 4,653 (49%) | 3,676 (56%) / 2,867 (44%) |
LBP at all 1994 (LBP > 0 days past year), n (%) | 3,109 (33%) | 2,246 (35%) |
Persistent LBP 1994 (LBP > 30 days past year), n (%) | 588 (6%) | 401 (6%) |
Number of days with LBP 1994, mean (SD) | 10.49 (38.62) | 10.83 (39.04) |
LBP at all 2002 (LBP > 0 days past year), n (%) | Not applicable | 2,546 (39%) |
Persistent LBP 2002 (LBP > 30 days past year), n (%) | Not applicable | 636 (10%) |
Number of days with LBP 2002, mean (SD) | Not applicable | 17.42 (53.94) |
Smokers at baseline (ever smoked), n (%) | 1,960 (21%) | 1,250 (19%) |
Alcohol-consumers at baseline (> 0.2 g alcohol/day), n (%) | 5,349 (66%) | 3,818 (67%) |
Overweight at baseline (BMI > 24), n (%) | 963 (10%) | 663 (10%) |