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Table 1 Comparison of social factors, low back pain (LBP) and sickleave obtained at baseline for responders and non-responders at three subsequent surveys (Survey 1, survey 2 and 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

Variables of interest Survey 1 Survey 2 Survey 3
Responders% [CI] (n = 412) Non responders% [CI] (n = 213) Responders% [CI] (n = 348) Non responders% [CI] (n = 64) Responders% [CI] (n = 293) Non responders% [CI] (n = 119)
Gender
Female 52 [47–57] 45 [38–52] 54 [49–59] 41 [29–53] 54 [48–60] 47 [38–56]
Employment status
Self employed 7 [5–9] - 7 [4–10] 8 [1–15] 7 [4–10] 8 [3–13]
Assisting spouse 0 - 1 [0–2] 0 0 1 [0–3]
Employed 84 [80–88] - 86 [82–90] 72 [61–83] 87 [83–91] 76 [68–84]
Unemployed 4 [2–6] - 3 [1–5] 9 [2–16] 3 [1–5] 8 [3–13]
Pensioner 3 [1–5] - 2 [1–3] 8 [1–15] 1 [0–2] 6 [2–10]
Others outside labor force 2 [1–3] - 2 [1–3] 3 [0–7] 2 [0–4] 3 [0–6]
Highest educational level
Basic school 22 [18–26] - 21 [17–25] 28 [17–39] 19 [15–23] 30 [22–38]
General upper-secondary education 2 [1–3] - 3 [1–5] 0 2 [0–4] 3 [0–6]
Vocational education/training 31 [27–35] - 32 [27–37] 25 [14–36] 34 [29–39] 24 [16–32]
Short-cycle higher education 20 [16–24] - 21 [17–25] 17 [8–26] 21 [16–26] 19 [12–26]
Medium-cycle higher education 19 [15–23] - 18 [14–22] 23 [13–33] 19 [15–23] 18 [11–25]
Long-cycle higher education 6 [4–8] - 5 [3–7] 6 [0–12] 5 [3–7] 7 [2–12]
LBP past year
Yes 69 [65–73] - 68 [63–73] 77 [67–87] 69 [64–74] 76 [68–84]
Number of days with LBP past year
0 30 [26–34] - 32 [27–37] 20 [10–30] 32 [27–37] 24 [16–32]
1-30 45 [40–50] - 45 [40–50] 47 [35–59] 46 [40–52] 43 [34–52]
>30 25 [21–29] - 23 [19–27] 33 [21–45] 21 [19–24] 34 [25–43]
Sick-leave past year because of LBP
No 80 [76–84] - 84 [80–88] 80 [70–90] 85 [81–89] 74 [66–82]
Number of days with sick-leave past year
0 80 [76–84] - 80 [76–84] 80 [70–90] 82 [78–86] 74 [66–82]
1-30 15 [12–18] - 15 [11–19] 13 [5–21] 13 [9–17] 18 [11–25]
>30 5 [3–7] - 5 [3–7] 8 [1–15] 4 [2–6] 8 [3–13]
  1. Values among non-responders at survey 2 and survey 3 that deviate the most from the baseline estimates of the responders are identified in bold.