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J Int Assoc Physicians AIDS Care (Chic). 2009 Nov-Dec;8(6):367-74. doi: 10.1177/1545109709352884.

A simple single-item rating scale to measure medication adherence: further evidence for convergent validity.

Author information

1
Department of Psychology, University of Connecticut, Storrs, Connecticut 06269, USA. seth.k@uconn.edu

Abstract

BACKGROUND:

Self-report measures of medication adherence are inexpensive and minimally intrusive. However, the validity of self-reported adherence is compromised by recall errors for missed doses and socially desirable responding.

METHOD:

Examined the convergent validity of 2 self-report adherence measures administered by computerized interview: (a) recall of missed doses and (b) a single-item visual analogue rating scale (VAS). Adherence was also monitored using unannounced phone-based pill counts that served as an objective benchmark.

RESULTS:

The VAS obtained adherence estimates that paralleled unannounced pill counts (UPCs). In contrast, self-reported recall (SR-recall) of missed medications consistently overestimated adherence. Correlations with participant characteristics also suggested that the computer-administered VAS was less influenced by response biases than SR-recall of missed medication doses.

CONCLUSIONS:

A single-item VAS offers an inexpensive and valid method of assessing medication adherence that may be useful in clinical as well as research settings.

PMID:
19952289
PMCID:
PMC3015098
DOI:
10.1177/1545109709352884
[Indexed for MEDLINE]
Free PMC Article

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