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Table 1 Description of the sample – the baseline (1994) compared to follow-up (2002).

From: Are lifestyle-factors in adolescence predictors for adult low back pain? A cross-sectional and prospective study of young twins

  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%)