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Table 3 Predictors of hospitalisation due to HLDD including all factors from Table 2including physical fitness

From: Physical fitness as a predictor of herniated lumbar disc disease – a 33-year follow-up in the Copenhagen male study

Covariate HR (95% CI)
Strenuous work (work resulting in sweating)  
 Seldom/never (n = 2,328) 1 (reference)
 Occasionally (n= 1,186) 2.37 (1.36-4.13)
 Often (n= 247) 3.91 (1.82-8.38)
Height, cm  
 - 171 (n = 1,283) 1 (reference)
 172-177 (n = 1,355) 2.18 (1.10-4.32)
 178 + (n = 1,186) 1.88 (0.92-3.86)
Not in the final model, p > 0.10:  
Physical fitness (VO2Max)a  
 Low, - 32 (n= 2055) 1 (reference)
 High, 33 + (n= 1778) 0.88 (0.51-1.50)
Weight, kga  
 - 72 (n = 1,282) 1 (reference)
 73-80 (n = 1,278) 1.40 (0.69-2.86)
 81 + (n = 1,271) 1.81 (0.89-3.66)
  1. 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.