The development of the ProMAS: a Probabilistic Medication Adherence Scale

Patient Preference and Adherence
Mieke KleppeCees Midden

Abstract

Current self-report medication adherence measures often provide heavily skewed results with limited variance, suggesting that most participants are highly adherent. This contrasts with findings from objective adherence measures. We argue that one of the main limitations of these self-report measures is the limited range covered by the behaviors assessed. That is, the items do not match the adherence behaviors that people perform, resulting in a ceiling effect. In this paper, we present a new self-reported medication adherence scale based on the Rasch model approach (the ProMAS), which covers a wide range of adherence behaviors. The ProMAS was tested with 370 elderly receiving medication for chronic conditions. The results indicated that the ProMAS provided adherence scores with sufficient fit to the Rasch model. Furthermore, the ProMAS covered a wider range of adherence behaviors compared to the widely used Medication Adherence Report Scale (MARS) instrument, resulting in more variance and less skewness in adherence scores. We conclude that the ProMAS is more capable of discriminating between people with different adherence rates than the MARS.

Citations

Aug 1, 2015·Journal of Aerosol Medicine and Pulmonary Drug Delivery·Vicente PlazaUNKNOWN TAI Study Group
Jul 31, 2019·The British Journal of General Practice : the Journal of the Royal College of General Practitioners·Peter HayesAndrew W Murphy
Aug 16, 2017·Journal of Health Psychology·Mieke KleppeCees Midden
Oct 9, 2020·Journal of Medical Internet Research·Yu Heng KwanJulian Thumboo
Oct 10, 2020·Journal of Medical Internet Research·Yu Heng KwanJulian Thumboo
Feb 1, 2020·Multiple Sclerosis and Related Disorders·Efrat NeterAriel Miller
Dec 19, 2019·Journal of the Canadian Association of Gastroenterology·Reed T SuttonVivian W Huang
Feb 10, 2020·Research in Social & Administrative Pharmacy : RSAP·Joke WuytsVeerle Foulon

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Methods Mentioned

BETA
PCA

Software Mentioned

SPSS
ProMAS
PanelClix

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