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Table 3 The fewer the number of episodes of low back pain (LBP) the shorter the duration of this episode and the larger the number of episodes the longer the duration of episodes in a study sample from the general Danish population of 50-yr olds (N=261) followed fortnightly over 1 year

From: Evidence-based classification of low back pain in the general population: one-year data collected with SMS Track

Number of episodes with LBP per subject Longest duration of episodes of LBP per subject was 1 pain fortnight Longest duration of episodes of LBP per subject was ≥ 2 pain fortnights
N (%) N (%)
1 39/57 (68) 18/57 (32)
2 21/41 (51) 20/41 (49)
3 or 4 13/37 (35) 24/37 (65)
  1. Data obtained from a Danish general population of 50-year olds (N = 261) followed with fortnightly text-messages over one year.