Measuring drug exposure: concordance between defined daily dose and days' supply depended on drug class.

Abstract:

OBJECTIVES:To determine the concordance between two methods to measure drug exposure duration from pharmacy claim data. STUDY DESIGN AND SETTING:We conducted a cohort study using 2002-2007 US Medicaid data. Initiators of eight drug groups were identified: statins, metformin, atypical antipsychotics, warfarin, proton pump inhibitors (PPIs), angiotensin-converting enzyme (ACE) inhibitors, nonsteroidal anti-inflammatory drugs (ns-NSAIDs), and coxibs. For each patient, we calculated two measures of exposure duration using (1) observed days' supply available in US pharmacy claims and (2) the World Health Organisation's Defined Daily Dose (DDD) methodology. We used Wilcoxon signed rank tests to compare medians and Spearman correlations to assess correlation between the two measures. RESULTS:Cohort sizes ranged from 143,885 warfarin users to >3,000,000 ns-NSAID users. Similar median exposure durations were observed for ACE inhibitors (70 days vs.75 days), PPIs (44 days vs. 45 days), and coxibs (44 days vs. 45 days). The DDD method overestimated exposure duration for ns-NSAIDs and underestimated for the remaining drug groups, relative to days' supply. Spearman correlation coefficients ranged from 0.2 to 0.8. CONCLUSION:Using DDDs to estimate drug exposure duration can result in misclassification. The magnitude of this misclassification might depend on doses used which can vary according to factors such as local prescribing practices, renal function, and age.

journal_name

J Clin Epidemiol

authors

Sinnott SJ,Polinski JM,Byrne S,Gagne JJ

doi

10.1016/j.jclinepi.2015.05.026

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

107-13

eissn

0895-4356

issn

1878-5921

pii

S0895-4356(15)00273-5

journal_volume

69

pub_type

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