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Table 3 LBP in a Danish general population at ages 40/41 (survey 1) and at 44/45 (survey 2)

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 1 (N = 412) Number of days with LBP in the preceding year at survey 2 in relation to survey 1 (N = 348 participants +64 non-responders) % [95% CI]
0 1-30 >30 Non-responders
  (n = 112) (n = 146) (n = 90) (n = 64)
0 (n = 123) 44 [35–53] 38 [29–47] 7 [2–12] 11 [5–17]
1-30 (n = 187) 24 [18–30] 44 [37–51] 16 [11–21] 16 [11–21]
>30 (n = 102) 14 [7–21] 16 [9–23] 50 [40–60] 21 [13–29]
  1. Cross tabulation of the number of days with LBP in the past year for survey 1 vs. survey 2 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 2nd survey as compared to the 1st survey.