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Table 4 Descriptive data of the four study samples

From: Psychological and behavioral differences between low back pain populations: a comparative analysis of chiropractic, primary and secondary care patients

Variable   Sample A Sample B Sample C Sample D
n   480 128 273 235
Women % 53 10 48 55
Age Mean 45a 42 42 43
  S.D. 12.5 9.4 9.5 10.4
Pain duration, months Mean N.A. N.A. 37 32
  S.D. N.A. N.A. 60 59
Neck/thoracic pain % N.A. 72b 32e 41e
LBP % 96 94b 66e 46e
Mixed pain sites % 57 66 2f 13f
Pain radiating into leg % 21 N.A. N.A. N.A.
Have had LBP episode before % 75c N.A. N.A. N.A.
Have had LBP >30 days previous year % 66d N.A. N.A. N.A.
Population   Primary care, Chiropractic Primary care, sick listed with risk of chronicity Secondary care, multimodal single center Secondary care, multimodal multi center
  1. aN = 134, age was recorded at the second baseline in the RCT, therefore data could be recorded only in a minority of the population
  2. bHaving experienced once or several times during past year
  3. cN = 467, dN = 407
  4. eNP or LBP as primary pain sites
  5. fMixed as primary pain site, S.D. – Standard Deviation, N.A. – not available, LBP – Low Back Pain