Health Literacy Measurement Tool for Patients with Type 2 Diabetes Mellitus in Thailand
Keywords:Health Literacy, Health Literacy Measurement Tool, Type 2 DM
Background: The health literacy (HL) measurement tools have been various and not yet standardized.
Objectives: To investigates the properties of HL measurement tool for patients with type 2 diabetes mellitus
Methods: A cross-sectional study was conducted among 620 T2DM. Participants were interviewed about
the 62 health literacy items in three domains: (a) reading medical terms; (b) numeracy test; and (c) decision
making. The data were collected from January to April 2019. The reliability, discrimination, and difficulty
are examined using the Kuder-Richardson Reliability Coefficient (KR-20), indices of discrimination and
Results: The study found 49.8% aged older than 60 years, 80.2% had primary education level and 72.4%
received no insulin injections. The properties of the HL measurement tool were (1) the reliability is excellent
level for medical terms (KR-20 = 0.98) and good levels for both numeracy test and decision making (KR-20
= 0.72 and 0.79, respectively); (2) The index of discrimination are high for both medical terms and decision
making (r = 0.58 – 0.80 and 0.48-0.55, respectively) but low level for the numeracy test (r = 0.02 – 0.43);
(3) The indices of difficulty are high level for medical terms and decision making (p = 0.45 – 0.70 and 0.73
– 0.76, respectively) but low level for numeracy test (p=0.02 – 0.64).
Conclusions: The 62-item tool is considerably good to measure HL for patients with type 2 diabetes regarding
its reliability, discrimination, and difficulty. However, the numeracy test should be more developed to the
discrimination and difficulty.