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Table 4 Risk factors for LBP lasting seven or more consecutive days after one year of follow-up (LBP at t1) in multivariate analyses.

From: Physical characteristics of the back are not predictive of low back pain in healthy workers: A prospective study

Asymptomatic workersa
    LBP at t1 UNIVARIATE ANALYSES MULTIVARIATE ANALYSES
   n n % RR 95%CI P-value RR 95%CI P-value
Body mass index (kg/m2) Normal 228 20 8.8 1.00   0.056 1.00   0.056
  Overweight 63 4 6.3 0.72 (0.25 – 2.12)   0.72 (0.25 – 2.12)  
  (≥25 and <30)          
  Obese (≥ 30) 31 7 22.6 2.57 (1.09–6.09)   2.57 (1.09 – 6.09)  
Mildly symptomatic workers b
Current LBP (reported before the physical examination) No 322 49 15.2 1.00   0.007 1.00   0.024
  Yes 4 3 75.0 4.93 (1.54–15.81)   3.89 (1.20 – 12.64)  
Difference in excursion of the middle finger on the thigh between lateral flexion to the right and to the left (cm)           
      1.00   0.014 1.00   0.023
      0.77 (0.62–0.95)   0.78 (0.63–0.97)  
  1. RR = relative risk/95%CI = 95% confidence interval
  2. a Cox-regression, backward selection, pin = 0.20, pout = 0.05. Adjusted additionally for the fingertip-to-floor distance, age and gender.
  3. b Cox-regression, backward selection, pin = 0.20, pout = 0.05. Adjusted additionally for the difference between the range of straight-leg-raising right-left (degrees), age and gender.