| PMC full text: | Published online 2013 Sep 2. doi: 10.1186/2045-709X-21-30
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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
| 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) |