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Table 4 LBP in a Danish general population at ages 44/45 (survey 2) and at 48/49 (survey 3)

From: Stability of low back pain reporting over 8 years in a general population aged 40/41 years at base-line: data from three consecutive cross-sectional surveys

Number of days with LBP in the preceding year at survey 2 (n = 348) Number of days with LBP in the preceding year at survey 3 in relation to survey 2 (N = 293 participants +119 non-responders) % [95% CI]
0 1-30 >30 Non-responders
  (n = 72) (n = 152) (n = 69) (n = 55)
0 (n = 112) 38 [29–47] 35 [26–44] 8 [3–13] 20 [13–17]
1-30 (n = 146) 16 [10–22] 58 [50–66] 16 [10–22] 14 [8–20]
>30 (n = 90) 8 [2–14] 31 [21–41] 40 [30–50] 19 [13–29]
  1. Cross tabulations of the number of days with LBP in the past year for survey 2 vs. survey 3 when taking non responders into account. The table shows the proportions of people in each category in percentages (%) with 95% confidence intervals (95% CI) which were found in the same or in a different category of LBP duration at the 3rd survey as compared to the 2nd survey.