“…Operationalizing income status via method of payment for services-specifically Medicaid as a proxy for low-income status-is an established approach in the literature (e.g., Buck, Msall, Schisterman, Lyon, & Rogers, 2000;Hurt & Betancourt, 2015;Marcin, Schembri, & Romano, 2003;Schechter & Margolis, 1998) and has been used in studies utilizing HCUP data (e.g., Albrecht et al, 2010;Correa, Bardenheier, Elixhauser, Geiss, & Gregg, 2015). Based on previous studies, the analysis also controlled for multiple covariates (e.g., Correa et al, 2015;Friedman, Zhong, Gelaye, Williams, & Peterlin, 2018;Jinjuvadia et al, 2018), including age (continuous), urbanicity of patient (1 = central urban, 2 = suburban, 3 = exurban, 4 = rural, 5 = micropolitan, 6 = other), and hospital region of the county (1 = Northeast, 2 = Midwest, 3 = South, 4 = West).…”