A Canadian exploratory study to define a measure of health literacy

Abstract

This study undertook a qualitative exploration of an operational definition of health literacy and an examination of quantitative measures of health literacy skills. We interviewed 229 older Canadian adults. First we engaged them in open-ended discussions about their search for information on a self-selected health topic. Next we administered nine self-report items on health literacy skills, and then task-performance items. Task-performance questions were based on two published reading passages on five levels of difficulty to measure 'understanding' of health-related material. The Rapid Estimate of Adult Literacy in Medicine (REALM) was also administered as the comparison for criterion-related validity. Our open-ended questions elicited responses about the processes that people undergo when they attempt to access, understand, appraise and communicate health information. Qualitative findings revealed complexities in participants' interpretation of the meaning of all four health literacy skills. These descriptive findings add new knowledge about health literacy as a construct. Participants agreed with most of the self-report statements, thus indicating high belief in their own health literacy. REALM scores ranged from 45 to 66 with an average of 65 and standard deviation of 2.5. Quantitative scores on the reading passages were modestly correlated with scores on the REALM. The sum scale of self-report items, however, did not correlate with task-performance items, suggesting that the different types of items may not be measuring the same construct. We suggest that self-report items need more development and validation. Our study makes a contribution in exploring the complexities of measuring health literacy skills for general health contexts.