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Description of sample and comparison of baseline- and follow-up-sample. |
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| Baseline |
Follow-up |
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| 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%) |
Hestbaek et al. BMC Musculoskeletal Disorders 2006 7:29 doi:10.1186/1471-2474-7-29 |
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