Results. A signifi cant positive association was found between
BMI and risk of LBP among persons without LBP at baseline. The
odds ratio for BMI 30 or more versus BMI less than 25 was 1.34
(95% confi dence interval [CI], 1.08–1.67) for men and 1.22 (95%CI, 1.03–1.46) for women, in analyses adjusted for age, education,
work status, physical activity at work and in leisure time, smoking,
blood pressure, and serum lipid levels. A signifi cant positive
association was also established between BMI and recurrence of
LBP among women. LBP status at baseline had negligible infl uence
on subsequent change in BMI