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Table 4.

Binary logistic regression model for presence of back pain.

OR95% CIp-value
Gender
 Male0.510.45–0.59<0.01**
 FemaleRef
School grade
 50.480.35–0.57<0.01**
 60.490.39–0.62<0.01**
 70.960.74–1.230.79
 81.10.83–1.440.50
 9Ref
BMI (kg/m2)1.041.02–1.05<0.01**
Percentage bag to body weight1.031.01–1.04<0.01**
BMI: body mass index
OR: Odds ratio
CI: confidence interval.

**p-value significant at <0.01.