Internal consistency is the degree of interrelatedness within items in a multi-item measure or tool such as a Patient Reported Outcome Measure (PROM) and the consistency of an individual item in a measure. There are three types of internal consistency reliability, and each type is a statistical measure. The three internal consistency measures are Cronbach’s Alpha, split-half test, and Kuder-Richardson test. The typical measure is the Cronbach’s Alpha which has a range of 0-1. The closer to 1, the more reliable the assessment. The scale determines how much agreement each item in a test has. The more agreement, the more the question are aligned or alike. The scale is as follows: 0.00-0.69=Poor alignment, 0.70-0.79= Fair alignment, 0.80-0.89= Good alignment, 0.90-0.99= Strong alignment.

How to cite: Internal Consistency Reliability [online]. (2016). York; York Health Economics Consortium; 2016.


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