Table 1 The description and prevalence of the potential risk factors (N=129)

From: Disc degeneration of the lumbar spine in relation to overweight

Variable N %
Occupation
 Construction carpenter 37 29
 Machine operator 43 33
 Office worker 49 38
History of overweight
 BMI ≥25 kg/m2 at the age of 25 and 40–45 y 18 14
 Othera 52 40
 BMI <25 kg/m2 at the age of 25 and 40–45 y 59 46
History of accidental back injuries before baseline study
 One or more injuries before baseline 32 25
 No injuries before baseline 94 75
Smoking status at baseline
 Smoker 44 34
 Ex-smoker 39 31
 Non-smoker 45 35
History of car driving before baseline study
 >15 000 km/y 37 29
 Less driving 92 71
  1. aOther: BMI ≥25 kg/m2 either at the age of 25 or 40–45 y.