The Effect of Area-Level Disadvantage and Race on Smoking Abstinence in a Clinical Trial
Abstract
Reasons for Black-White disparities in smoking abstinence are not well understood. This study examined area-level socioeconomic disadvantage as a contributor to lower quit rates for Blacks who smoke among 223 Black and 221 White low-income individuals who smoke enrolled in a smoking cessation trial. Outcome was cotinine-verified abstinence at week 26. Census tract-level disadvantage was measured using 5-year estimates linked to participants’ home address and included percentage of: female headed households; public assistance; unemployed; 25% having less than a high school education. A neighborhood disadvantage index score (DIS) was calculated as the sum of z-scores for each variable. Black participants lived in more disadvantaged areas than White participants [DIS mean (SD): 3.2 (4.3), −1.0 (3.2), p < 0.001]. Similar rates of abstinence were observed at the same level of disadvantage [DIS ≥ 50th percentile (less disadvantage): 21.9% Blacks, 26.2% Whites, p = 0.50; DIS < 50th percentile (more disadvantage): 10.7% Blacks, 15.8% Whites, p = 0.31]. Only DIS but neither race nor the interaction was retained in the final model predicting abstinence; each unit increase in DIS was associated with 9% reduced odds of abstinence (OR: 0.91, 95% CI: 0.87, 0.96). Findings point to the importance of examining factors associated with race that contribute to health inequities and underscore the need to consider how consequences of systemic racism, such as neighborhood context and other…
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