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Table 1 Description of sample and comparison of baseline- and follow-up-sample.

From: Is comorbidity in adolescence a predictor for adult low back pain? A prospective study of a young population

  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%)