Table 1 Description of sample and comparison of baseline- and follow-up-sample.
Baseline | Follow-up | |
|---|---|---|
Responders, n (%) | 9,600 (84%) | 6,554 (57% of the original sample, 68% of the baseline sample) |
Age at baseline, mean (range) | 17.27 (11–22) | 17.38 (11–22) |
Female/male, n (%) | 4,946 (52%)/4,654 (48%) | 3,682 (56%)/2,868 (44%) |
LBP-long 1994 (LBP>30 days past year), n (%) | 588 (6%) | 401 (6%) |
LBP-all 1994 (LBP>0 days past year), n (%) | 3,223 (34%) | 2,322 (35%) |
Number of days with LBP 1994, mean (SD) | 10.46 (38.37) | 10.80 (38.78) |
Headache-long | 591 (7%) | 414 (7%) |
Headache-all | 8.266 (86%) | 5.635 (86%) |
Asthma | 2.685 (28%) | 1.785 (27%) |
Atopic disease | 998 (10%) | 707 (11%) |