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Table 2 Days with low back pain (LBP) in the preceding year in a Danish general population aged 40/41 at baseline surveyed 3 times over 8 years

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

  Survey 1 Survey 2 Survey 3
Including the responders only Including the responders only SAME AS BEFORE SCENARIO: Including the non responders categorized under their previous sub-group WORST CASE SCENARIO: Including the non responders categorized under the worst sub-group (>30) Including the responders only SAME AS BEFORE SCENARIO: Including the non responders categorized under their previous sub-group WORST CASE SCENARIO: Including the non responders categorized under the worst sub-group (>30)
N = 412 N = 348 N = 412 N = 412 N = 293 N = 348 N = 348
Number of days with LBP past year % [95% CI] % [95% CI] % [95% CI] % [95% CI] % [95% CI] % [95% CI] % [95% CI]
0 30 [26–34] 32 [27–37] 30 [26–34] 27 [23–31] 25 [20–30] 25 [20–30] 21 [17–25]
1-30 45 [40–50] 42 [37–47] 43 [38–48] 35 [30–40] 52 [46–58] 50 [45–55] 44 [39–49]
>30 25 [21–29] 26 [21–31] 27 [23–31] 37 [32–42] 24 [19–29] 25 [20–30] 36 [31–41]
  1. Prevalence estimates have been calculated in 3 different ways: including 1) the responders only; 2) the non responders categorized under their previous sub-group; and 3) the non responders categorized under the worst sub-group (>30 days).