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Table 2 Seven low back pain (LBP) groups classified into three main clusters based on frequency and 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

Main subgroups Percentages of participants fitting into the main subgroups (95% confidence interval) Subsets making up the main subgroups Percentages of participants fitting into the subsets (95% confidence interval)
More or less constant LBP 35% (29–41) • LBP every day 3% (2.8-3.2)
• No LBP free fortnights at all (but not pain every day) 9% (6–12)
• At least one long-lasting period of LBP (i.e. at least 6 pain fortnights in a row) but none of the above. 23% (18–28)
Episodic LBP 30% (24–36) • At least one longer episode of LBP (i.e. at least 2 pain fortnights in a row). 23% (18–28)
• Several brief episodes of LBP (maximum of 1 pain fortnight and none longer than 1 fortnight. 6% (3–9)
More or less never LBP 35% (29–41) • Only 1 brief episode of LBP (i.e. maximum of 1 pain fortnight) and no other short or longer episodes. 16% (12–20)
• No LBP days at all. 19% (14–24)
  1. Data obtained from a Danish general population of 50-yr olds (N = 261) followed fortnightly with text messages over one year. Percentages have been rounded off.