Understanding factors associated with an increased risk of hospital admission from emergency department (ED) observation units (OUs) could be valuable in disposition decisions. To evaluate the impact of frailty and sociodemographic factors (SDFs) on admission risk, patients in an ED OU were surveyed. Survey measures included SDFs, social habits, and frailty measured by the Katz Index of Independence in Activities of Daily Living. Of 306 surveyed, 18% were admitted and 82% were discharged. Demographics were similar between groups. More admitted patients responded positively to the Katz Index (28% vs 13%, P = .007; odds ratio = 2.73; 95% CI = 1.35-5.51). College graduation and current employment favored the discharge group, while admitted patients were more likely to receive Social Security disability insurance. Frailty remained associated with admission on multivariable analysis. Frailty, disability insurance, and lower education are predictors of admission from an OU and could serve as screening criteria in disposition decisions.
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