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Table 1 Baseline Characteristics

From: Back beliefs in patients with low back pain: a primary care cohort study

VariableStudy sample at baseline (n = 2293)Excluded (n = 77)
Age in years, mean (SD)44 (14)55 (15)
Age range in years18–8720–80
Females41%52%
Episodes of LBP before current one,
 None17%19%
 1 episode14%6%
 2–3 episodes24%25%
 More than 3 episodes45%50%
 Missing (n)68045
Time since start of current episode of LBP,
 1–14 days60%55%
 2–4 weeks11%18%
 1–12 months18%17%
 More than a year10%11%
 Missing (n)144
Days with LBP during the previous year
 More than 30 days37%49%
 Missing (n)040
Back pain (VAS 0–10), mean (SD)6.7 (2.1)6.9
Back pain divided in quantiles
 0–526% 
 6–734% 
 823% 
 9–1017% 
Disability (RMDQ 0–23), mean (SD)12.7 (5.5)
RMDQ score divided into quantiles
 0–929% 
 10–1428% 
 15–1720% 
 18–2323% 
  1. SD standard deviation
  2. LBP low back pain
  3. VAS visual analogue scale
  4. RMDQ Roland-Morris Disability Questionnaire