Table 3 

Predictors of hospitalisation due to HLDD including all factors from Table 2 including physical fitness  
Covariate  HR (95% CI) 
Strenuous work (work resulting in sweating)  
Seldom/never (n = 2,328)  1 (reference) 
Occasionally (n= 1,186)  2.37 (1.364.13) 
Often (n= 247)  3.91 (1.828.38) 
Height, cm  
 171 (n = 1,283)  1 (reference) 
172177 (n = 1,355)  2.18 (1.104.32) 
178 + (n = 1,186)  1.88 (0.923.86) 
Not in the final model, p > 0.10:  
Physical fitness (VO_{2}Max)^{a}  
Low,  32 (n= 2055)  1 (reference) 
High, 33 + (n= 1778)  0.88 (0.511.50) 
Weight, kg^{a}  
 72 (n = 1,282)  1 (reference) 
7380 (n = 1,278)  1.40 (0.692.86) 
81 + (n = 1,271)  1.81 (0.893.66) 
Cox proportional hazards regression using backward elimination. Variables are ranked after statistical strength of association with the outcome following adjustment. Significant associations (p < 0.05) are highlighted (bold). ^{a}: association with herniated lumbar disc disease at time of withdrawal from the model.HR = hazard ratio; CI = confidence interval.
Jørgensen et al.
Jørgensen et al. BMC Musculoskeletal Disorders 2013 14:86 doi:10.1186/147124741486