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J Asthma. 2016 Dec;53(10):1085-9. doi: 10.1080/02770903.2016.1180699. Epub 2016 May 13.

Is the MARS questionnaire a reliable measure of medication adherence in childhood asthma?

Author information

1
a Deparment of General Pediatrics, Arrixaca University Children's Hospital , University of Murcia , Murcia , Spain.
2
b Princess Amalia Children's Center , Isala Hospital , Zwolle , The Netherlands.
3
c UMCG Postgraduate School of Medicine , University Medical Center, University of Groningen , The Netherlands.
4
d Unit of Psychology , Leiden University Medical Center , Leiden , The Netherlands.
5
e Department of Paediatric Pulmonology and Allergology , Wilhelmina Children's Hospital, University Medical Centre Utrecht , The Netherlands.

Abstract

OBJECTIVE:

To assess the reliability of the Medication Adherence Report Scale (MARS-5) for assessing adherence in clinical practice and research.

METHODS:

Prospective cohort study following electronically measured inhaled corticosteroids (ICS) adherence for 1 year in 2-13-year-old children with persistent asthma. The relationship between electronically measured adherence and MARS-5 scores (ranging from 5 to 25) was assessed by Spearman's rank correlation coefficient. A ROC (receiver operating characteristic) curve was performed testing MARS-5 against electronically measured adherence. Sensitivity, specificity, positive and negative likelihood ratios of the closest MARS-5 cut-off values to the top left-hand corner of the ROC curve were calculated.

RESULTS:

High MARS scores were obtained (median 24, interquartile range 22-24). Despite a statistically significant correlation between MARS-5 and electronically assessed adherence (Spearman's rho = 0.47; p < 0.0001), there was considerable variation of adherence rates at every MARS-5 score. The area under the ROC curve was 0.7188. A MARS-5 score ≥23 had the best predictive ability for electronically assessed adherence, but positive and negative likelihood ratios were too small to be useful (1.65 and 0.27, respectively).

CONCLUSIONS:

Self-report using MARS-5 is too inaccurate to be a useful measure of adherence in children with asthma, both in clinical practice and in research.

KEYWORDS:

MARS-5; adherence; asthma; children; electronic monitoring; inhaled corticosteroids

PMID:
27177241
DOI:
10.1080/02770903.2016.1180699
[Indexed for MEDLINE]

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