Table 1

Risk of LBP in relation to mechanical factors in quintiles using univariate analysis (n=1376)*

Mechanical factorsTotalNo. with LBP% LBPOdds ratio*(95% CI)
*ORs adjusted for age and gender in a logistic regression model.
Body mass index
    12.2 to 17.12635219.71.0(referent)
    17.2 to 18.62635621.31.0 (0.7 to 1.6)
    18.7 to 20.22685721.30.9 (0.6 to 1.4)
    20.3 to 22.42676921.81.2 (0.8 to 1.8)
    22.5 to 34.72627629.01.4 (0.9 to 2.1)
Average (5 day) load
    1.2 to 3.4 kg2164822.21.0(referent)
    3.5 to 4.2 kg2175223.91.2 (0.7 to 1.9)
    4.3 to 5.0 kg2205826.91.5 (0.9 to 2.3)
    5.1 to 6.3 kg2104722.41.1 (0.7 to 1.7)
    6.4 to 18.0 kg2174621.20.9 (0.6 to 1.4)
% body weight carried
    2.2 to 6.6%2145827.11.0(referent)
    6.7 to 8.8%2115425.61.0 (0.7 to 1.6)
    8.9 to 10.5%2044522.10.9 (0.5 to 1.4)
    10.6 to 13.5%2094622.00.9 (0.6 to 1.4)
    13.6 to 32.1%2103516.70.6 (0.4 to 1.0)