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Table 2 Univariate regression analyses: variables associated with back pain within 6 and 12 months of baseline

From: Risk factors for back pain in marines; a prospective cohort study

  Back pain within 6 months Back pain within 12 months
na Casesa (%) OR 95 % CI p-value na Casesa (%) OR 95 % CI p-value
Individual factors             
  Body weight (Kg)             
  < 87 . . . . . . 82 37 (45) 1.00 Reference .
  ≥ 87 . . . . . . 36 22 (61) 1.91 0.86–4.25 0.112
  Body height (m)             
  < 1.86 90 23 (26) 1.00 Reference . 74 30 (41) 1.00 Reference .
  ≥ 1.86 47 21 (45) 2.35 1.12–4.96 0.024 44 29 (66) 2.84 1.30–6.17 0.009
Health-related factors            
  Previous back painb           
 No 75.6 17 (22) 1.00 Reference . 90 36 (40) 1.00 Reference .
 Yes 61.4 27 (44) 3.60 1.59–8.14 0.002 28 23 (82) 6.90 2.40–19.82 <0.001
  Previous lower extremity painb           
 No 104 26 (25) 1.00 Reference . 66.6 27 (41) 1.00 Reference .
 Yes 33 18 (55) 2.71 1.29–5.68 0.008 51.4 32 (62) 2.43 1.45–5.14 0.021
  Previous neck/shoulder painb           
 No . . . . . . 83 38 (46) 1.00 Reference .
 Yes . . . . . . 35 21 (60) 1.78 0.80–3.96 0.160
Work-related factors             
  Military occupational function            
 Infantry (Assault) 93 26 (28) 1.00 Reference . 81 36 (44) 1.00 Reference .
 Ranger 24 7 (29) 1.06 0.39–2.86 0.907 20 11 (55) 1.52 0.57–4.09 0.399
 CBC-Crewc 20 11 (55) 3.15 1.17–8.48 0.023 17 12 (71) 3.00 0.97–9.30 0.057
  Sitting work           
  < 1/2 work day 111 31 (28) 1.00 Reference . 93 42 (45) 1.00 Reference .
  ≥ 1/2 work day 26 13 (50) 2.58 1.08–6.18 0.033 25 17 (68) 2.58 1.01–6.57 0.047
  Computer work           
  < 1/4 work day 112 33 (29) 1.00 Reference . 93 43 (46) 1.00 Reference .
  ≥ 1/4 work day 25 11 (44) 1.88 0.77–4.57 0.163 25 16 (64) 2.07 0.83–5.15 0.119
  Vibrating floor/seat            
  < 1/4 work day . . . . . . 86.8 39.8 (46) 1.00 Reference .
  ≥ 1/4 work day . . . . . . 31.2 19.2 (62) 1.89 0.82–4.38 0.135
Clinical test of movement control           
  Standing bow           
 Pass . . . . . . 76.2 42.2 (55) 1.00 Reference .
 Fail . . . . . . 41.8 16.8 (40) 0.54 0.24–1.20 0.129
  Double leg lift-lower           
 Pass 76.6 30.1 (39) 1.00 Reference . . . . . . .
 Fail 60.4 13.9 (23) 0.46 0.21–1.01 0.054 . . . . . .
  1. odds ratio (OR) with corresponding 95 % confidence interval (95 % CI) and significance level (p-value) for variables associated at p <0.20 with back pain within 6 and 12 months of baseline
  2. aBased on pooling of 30 imputed datasets
  3. bPain within 6 months prior to baseline
  4. cCBC-Crew; Combat Craft(Boat/Hovercraft) Crew
  5. .Category not applicable