Abstract
ObjectivesThis study aimed to validate a new consolidated measure of health literacy and numeracy (health literacy scale [HLS] plus the subjective numeracy scale [SNS]) in patients with type 2 diabetes (T2DM). MethodsA convenience sample (N = 102) of patients with T2DM was recruited from an academic family medicine center in the southeastern US between September-December 2017. Participants completed a questionnaire that included the composite HLS/SNS (22 questions) and a commonly used objective measure of health literacy—S-TOFHLA (40 questions). Internal reliability of the HLS/SNS was assessed using Cronbach’s alpha. Criterion and construct validity was assessed against the S-TOFHLA. ResultsThe composite HLS/SNS had good internal reliability (Cronbach’s alpha = 0.83). A confirmatory factor analysis revealed there were four factors in the new instrument. Model fit indices showed good model-data fit (RMSEA = 0.08). The Spearman’s rank order correlation coefficient between the HLS/SNS and the S-TOFHLA was 0.45 (p < 0.01). ConclusionsOur study suggests that the composite HLS/SNS is a reliable, valid instrument.
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