Association of health literacy with diabetes outcomes.
BACKGROUND
Health literacy is a measure of patients' ability to read, comprehend, and act on medical instructions. Poor health literacy is common among racial and ethnic minorities, elderly persons, and patients with chronic conditions, particularly in public-sector settings. Little is known about the extent to which health literacy affects clinical health outcomes.


OBJECTIVE
To examine the association between health literacy and diabetes outcomes among patients with type 2 diabetes.


METHODS
Cross-sectional observational study of 408 English- and Spanish-speaking patients who were older than 30 years and had type 2 diabetes identified from the clinical database of 2 primary care clinics of a university-affiliated public hospital in San Francisco, Calif. Participants were enrolled and completed questionnaires between June and December 2000. We assessed patients' health literacy by using the short-form Test of Functional Health Literacy in Adults (s-TOFHLA) in English or Spanish.


METHODS
Most recent hemoglobin A(1c) (HbA(1c)) level. Patients were classified as having tight glycemic control if their HbA(1c) was in the lowest quartile and poor control if it was in the highest quartile. We also measured the presence of self-reported diabetes complications.


RESULTS
After adjusting for patients' sociodemographic characteristics, depressive symptoms, social support, treatment regimen, and years with diabetes, for each 1-point decrement in s-TOFHLA score, the HbA(1c) value increased by 0.02 (P =.02). Patients with inadequate health literacy were less likely than patients with adequate health literacy to achieve tight glycemic control (HbA(1c) < or = 7.2%; adjusted odds ratio [OR], 0.57; 95% confidence interval [CI], 0.32-1.00; P =.05) and were more likely to have poor glycemic control (HbA(1c) > or = 9.5%; adjusted OR, 2.03; 95% CI, 1.11-3.73; P =.02) and to report having retinopathy (adjusted OR, 2.33; 95% CI, 1.19-4.57; P =.01).


CONCLUSIONS
Among primary care patients with type 2 diabetes, inadequate health literacy is independently associated with worse glycemic control and higher rates of retinopathy. Inadequate health literacy may contribute to the disproportionate burden of diabetes-related problems among disadvantaged populations. Efforts should focus on developing and evaluating interventions to improve diabetes outcomes among patients with inadequate health literacy.
University of California, San Francisco, Primary Care Research Center, Department of Medicine, San Francisco General Hospital, San Francisco, CA 94110, USA. dean@itsa.ucsf.edu
Dean
D
Schillinger
Kevin
K
Grumbach
John
J
Piette
Frances
F
Wang
Dennis
D
Osmond
Carolyn
C
Daher
Jorge
J
Palacios
Gabriela Diaz
GD
Sullivan
Andrew B
AB
Bindman
D001786:Blood Glucose / Q000378:metabolism; D003430:Cross-Sectional Studies; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000503:physiopathology / Q000517:prevention & control*; D018450:Disease Progression; D004521:Educational Measurement; D004522:Educational Status; D005260:Female; D006442:Glycated Hemoglobin / Q000378:metabolism; D006302:Health Services Research; D006801:Humans; D008297:Male; D008875:Middle Aged; D010353:Patient Education as Topic; D011320:Primary Health Care; D012044:Regression Analysis
D001786:Blood Glucose; D006442:Glycated Hemoglobin