Pooled Multivariable Analyses: Predictors of Frequent ER Visits Using Unclustered and Clustered Data.

a Denotes statistical significance. p <0.05 considered statistically significant. b Defined as one or more housing status changes within a 1 year follow-up period from index ambulatory visit. c Reference group for these categories are patients without these health characteristics. d Health service utilization data collected over a 1 year follow-up time period from index ambulatory visit. Reference group was 0–2 visits per year. Pooled Multivariable Analyses: Predictors of Frequent ER Visits Using Unclustered and Clustered Data.