Low Back Pain: A Follow-up in the Nord-Trøndelag Health Study*
http://journals.lww.com/
Heuch, Ingrid MD, PhD
Spine: 15 January 2013 - Volume 38 - Issue 2 - p 133--139
Study Design. A population-based, prospective cohort study.
Objective. To determine whether overweight, obesity, or more generally
an elevated body
mass index (BMI) increase the probability of experiencing chronic low
back pain (LBP) after
an 11-year period, both among participants with and without LBP at baseline.
Summary of Background Data. Chronic LBP is a common disabling disorder
in modern society.
Cross-sectional studies suggest an association between an elevated BMI
and LBP, but it is not
clear whether this is a causal relationship.
Methods. Data were obtained from the community-based HUNT 2 (1995--1997)
and HUNT 3
(2006--2008) studies of an entire Norwegian county. Participants were
8733 men and 10,149
women, aged 30 to 69 years, who did not have chronic LBP at baseline,
and 2669 men and
3899 women with LBP at baseline. After 11 years, both groups indicated
whether they currently
had chronic LBP, defined as pain persisting for at least 3 months
continuously during the last year.
Results. A significant 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% confidence 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 significant positive
association was also established
between BMI and recurrence of LBP among women. LBP status at baseline
had negligible influence
on subsequent change in BMI.
Conclusion. High values of BMI may predispose to chronic LBP 11 years
later, both in individuals
with and without LBP. The association between BMI and LBP is not
explained by an effect of LBP
on later change in BMI.
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