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Table 1 Age, sex and spinal pain characteristics for the four cohorts. Where nothing else is noted, results are reported as proportions with 95% confidence intervals (CI)

From: Are frequent measurements in back pain research harmful? Two comparisons of back pain in groups with or without frequent follow-up

  Cohort 1 (no SMS)
n = 1291
Cohort 1b (SMS)
n = 215
  Cohort 2a (no SMS)
n = 36
Cohort 2b (SMS)
n = 161
5th grade
6th grade
50%
50%
40%
60%
Age at baseline mean (95%CI) 48
(45–52)
47
(45–48)
Male 52%
(49–54%)
43%
(36–50%)
Male 47%
(30–65%)
41%
(33–49%)
NPa 36%
(33-39%)
36%
(29–42%)
   
MBPa 24%
(21-26%)
28%
(22–34%)
Bothersomeness past 2 weeksc
Median (IQR)
3 (2–4) 2 (2–3)
LBPa 16%
(14-18%)
24%
(18–30%)
> 30 days of LBP previous year 72%
(54–86%)
62%
(54–70%)
SP 46%
(44–49%)
50%
(43–56%)
RMDQd
mean (95% CI)
39
(29–49)
29
(24–33)
Pain intensityb
mean (95% CI)
4.74
(4.46–5.02)
3.89
(3.52–4.27)
VAS past week
mean (95% CI)
4.61
(3.43–5.79)
3.23
(2.81–3.65)
  1. a‘often or some times’
  2. bFPS-r converted to a 0 to 10 scale for the spinal region with the highest reported pain intensity (only for those with a report of pain)
  3. cfive-point Likert scale
  4. dProportional score on the Roland Morris Disability Questionnaire