Psychometric properties of the eight-item Morisky Medication Adherence Scale (MMAS-8) in a psychiatric outpatient setting.

Int J Clin Health Psychol · 2015 · PMC6224788 · PMID 30487829

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highly significantp = .000not a probability at all

This coefficient increased slightly if Item 7 was deleted (α = .77), and the item-total correlation for this item was .16, which was highly significant ( p = .000).

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a clear trendno p-value reported

Leaving aside the problems inherent to Likert-type scales, which can confound some results (i.e., Hartley, 2014 ), the MMAS-8 scale showed adequate construct validity, with a clear trend toward a one-factor solution; all the items contributed to the final index of adherence.

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