Illicit Substance Use in US Adults With Chronic Low Back Pain.

STUDY DESIGN A population-based cross-sectional survey. OBJECTIVE The aim of this study was to compare the prevalence of illicit drug use among US adults with and without chronic low back pain (cLBP). SUMMARY OF BACKGROUND DATA Although addictive medications, such as opioids and benzodiazepines, are frequently prescribed to patients with cLBP, little is known about illicit drug use among Americans with cLBP. METHODS We used data from the back pain survey, administered to a representative sample of US adults aged 20 to 69 years (N = 5103) during the 2009 to 2010 cycle of the National Health and Nutrition Examination Survey (NHANES). Participants with pain in the area between the lower posterior margin of the ribcage and the horizontal gluteal fold for at least 3 months were classified as having cLBP (N = 700). The drug use questionnaire was self-administered in a private setting, and included data on lifetime and current use of marijuana or hashish, cocaine, heroin, and methamphetamine. Chi-square tests, one-way analysis of variance, and logistic regression, adjusted for age, gender, race, and level of education, were used for comparisons. RESULTS About 46.5% of US adults with cLBP used marijuana versus 42% of those without cLBP [Adjusted odds ratio (aOR) 1.36, 95% confidence interval (95% CI) 1.06-1.74]. About 22% versus 14% used cocaine (aOR 1.80, 95% CI 1.45-2.24), 9% versus 5% used methamphetamine (aOR 2.03, 95% CI 1.30-3.16), and 5% versus 2% used heroin (aOR 2.43, 95% CI 1.44-4.11). Subjects with cLBP who reported lifetime illicit drug use were more likely to have an active prescription for opioid analgesics than those without illicit drug use history: 22.5% versus 15.3%, P = 0.018. CONCLUSION cLBP in community-based US adults was associated with higher odds of using marijuana, cocaine, heroin, and methamphetamine. Prescription opioid analgesic use was more common in cLBP sufferers with a history of illicit drug use. LEVEL OF EVIDENCE 2.