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Relationship between early prescription dispensing patterns and work disability in a cohort of low back pain workers’ compensation claimants: a historical cohort study
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Relationship between early prescription dispensing patterns and work disability in a cohort of low back pain workers’ compensation claimants: a historical cohort study
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Relationship between early prescription dispensing patterns and work disability in a cohort of low back pain workers’ compensation claimants: a historical cohort study
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Journal Article
Relationship between early prescription dispensing patterns and work disability in a cohort of low back pain workers’ compensation claimants: a historical cohort study
2019
Overview
ObjectivesTo examine and compare whether dispensing of prescription opioids, non-steroidal anti-inflammatory drugs (NSAIDs) and skeletal muscle relaxants (SMRs) within 8 weeks after a work-related low back pain (LBP) injury is associated with work disability.MethodsA historical cohort study of 55 571 workers’ compensation claimants with LBP claims in British Columbia from 1998 to 2009 was conducted using linked compensation, dispensing and healthcare data. Four exposures were constructed to estimate the effect on receipt of benefits and days on benefits 1 year after injury: drug class(es) dispensed, days' supply, strength of opioids dispensed and average daily morphine-equivalent dose.ResultsCompared with claimants receiving NSAIDs and/or SMRs, the incidence rate ratio (IRR) of days on benefits was 1.09 (95% CI 1.04 to 1.14) for claimants dispensed opioids only and 1.26 (95% CI 1.22 to 1.30) for claimants dispensed opioids with NSAIDs and/or SMRs. Compared with weak opioids only, the IRR for claimants dispensed strong opioids only or strong and weak opioids combined was 1.21 (95% CI 1.12 to 1.30) and 1.29 (95% CI 1.20 to 1.39), respectively. The incident rate of days on benefits associated with each 7-day increase in days supplied of opioids, NSAIDs and SMRs was 10%, 4% and 3%, respectively. Similar results were seen for receipt of benefits, though effect sizes were larger.ConclusionsFindings suggest provision of early opioids leads to prolonged work disability compared with NSAIDs and SMRs, though longer supplies of all drug classes are also associated with work disability. Residual confounding likely partially explains the findings. Research is needed that accounts for prescriber, system and workplace factors.
Publisher
BMJ Publishing Group Ltd,BMJ,BMJ Publishing Group LTD,BMJ Publishing Group
Subject
/ Adult
/ Analgesics, Opioid - therapeutic use
/ Anti-Inflammatory Agents, Non-Steroidal - therapeutic use
/ Back Injuries - complications
/ Back Injuries - drug therapy
/ Bias
/ Drug Prescriptions - statistics & numerical data
/ Female
/ Humans
/ Injuries
/ Low Back Pain - drug therapy
/ Male
/ Morphine
/ Muscles
/ Neuromuscular Agents - therapeutic use
/ Nonsteroidal anti-inflammatory drugs
/ Occupational Injuries - complications
/ Occupational Injuries - drug therapy
/ Opioids
/ Pain
/ Practice
/ Studies
/ Workers
