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Table 3 Hurdle regression model, with count and hurdle components, on the association of leg-length discrepancy (LLD) greater than 5 mm and other explanatory variables with self-reported number of days with low back pain during the past year

From: Leg-length discrepancy is associated with low back pain among those who must stand while working

  Hurdle Count
Unadjusted OR(95% CI) AdjustedaOR(95% CI) Unadjusted MR(95% CI) AdjustedaMR (95% CI)
LLD > 5 mm     
No 1.00 1.00 1.00 1.00
Yes 1.45 (0.67-3.13) 1.35 (0.56-3.20) 2.32 (1.33-4.05)** 2.89 (1.63-5.09)***
Depressive feelings   1.27 (1.07-1.52)**   1.09 (1.01-1.17)*
Gender     
Male   1.00   1.00
Female   0.69 (0.24-1.92)   0.39 (0.19-0.77)
Smoking     
No   1.00   1.00
Yes   2.63 (0.80-8.65)   0.53 (0.28-0.97)
Age   0.96 (0.90-1.01)   0.99 (0.95-1.02)
Working position b     
Sitting   1.00   1.00
Standing   2.57 (0.87-7.69)   1.95 (0.93-4.09)
  1. aAdjusted for all variables in the table; bSitting=customary workers, standing=meat cutters; MR=mean ratio and OR=odds ratio; *p < 0.05, **p < 0.01, ***p < 0.001.