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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