Table 1

Characteristics of the study population at baseline (Military Health Examination), 1967–1994 and follow-up (Health 2000 Survey), 2000–2001

NMean (95% CI)Prevalence (%, 95% CI)
Age (years)At baseline138519.7 (19.6 to 19.8)
At follow-up138540.2 (39.9 to 40.5)
BMI (kg/m2)At baseline138422.3 (22.1 to 22.4)
At follow-up138526.5 (26.3 to 26.7)
Regular smokersAt baseline303/88034.4 (31.3 to 37.7)
At follow-up454/138032.9 (30.4 to 35.5)
Physically active at leisure timeAt baseline447/84652.8 (49.3 to 56.2)
At follow-up1008/137073.6 (71.2 to 75.9)
Spinal symptoms and/or signsAt baseline208/138515.0 (13.2 to 17.0)
Low back symptomsAt baseline113/13858.2 (6.8 to 9.7)
Waist circumferenceAt follow-up138095.3 (94.8 to 95.9)
Hip circumferenceAt follow-up138099.1 (98.7 to 99.5)
Education (years)At follow-up136612.8 (12.6 to 13.0)
LBP, preceding 30 daysAt follow-up
 Non-specific393/138528.4 (26.0 to 30.8)
 Radiating162/138511.7 (10.1 to 13.5)
Physician-diagnosed disorders*At follow-up
 Chronic low back syndrome100/13507.4 (6.1 to 8.9)
 Sciatica58/13504.3 (3.3 to 5.5)
  • *Information is missing for 35 men.

  • BMI, body mass index; LBP, low back pain.