Health Literacy Matters More Than Experience for Advance Care Planning Knowledge Among Older Adults

Abstract

BACKGROUND Advance care planning (ACP) engagement is low among vulnerable populations, including those with limited health literacy (LHL). Limited knowledge about ACP may be a modifiable mediator of the relationship between LHL and ACP. Our goal was to determine whether health literacy is associated with ACP knowledge. DESIGN Cross‐sectional design. SETTING A public health delivery system and Veterans Affairs Medical Center in San Francisco, CA. PARTICIPANTS English‐ and Spanish‐speaking patients (N = 1400). MEASUREMENTS ACP knowledge was assessed with seven validated multiple‐choice questions. Health literacy was measured using a validated scale. Sociodemographic measures included age, sex, language, education, race, health status, and social support. Prior ACP experience was defined as having documented legal forms and/or goals‐of‐care discussions in the medical record. We used Kruskal‐Wallis tests and linear regression to examine associations of ACP knowledge with LHL, prior ACP experience, and sociodemographic factors. RESULTS Mean age of participants was 65 (±10) years, 48% were women, 34% had LHL, 32% were Spanish speaking, 47% had high school education or less, and 70% were nonwhite. Mean 7‐point knowledge scores were lower for those with limited vs adequate health literacy (3.8 [SD = 1.9 vs 5.5 (SD = 1.7); P < .001). In multivariable analysis, ACP knowledge scores were 1.0 point lower among those with LHL; 0.6 points lower among Spanish speakers and those with high school education or less; and 0.5 points lower among individuals of nonwhite race (P < .001 for all). Knowledge scores were 0.02 points lower per year of older age (P = .007) and 0.01 points higher per point of greater social support (P = .005). Prior ACP experience was not associated with knowledge after adjustment (P = .7). CONCLUSIONS Health literacy and sociodemographics are stronger predictors than prior ACP experience of ACP knowledge. This study suggests that providing easy‐to‐understand ACP materials is paramount and should be offered even if patients have previous experience with the ACP process. J Am Geriatr Soc 67:2151–2156, 2019

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