Table 4.

Hazard Ratios for All-Cause Mortality by Cross-Tabulation of Institute of Medicine and Missed-Visits Retention Measures^a

Retention per IOM Measureb	HR for All-Cause Mortality (95% CI)
	Retained per Missed-Visits Measure (0 No-Shows)	Not Retained per Missed-Visits Measure (≥1No-Show)
Retained	Referent	1.72c (1.33–2.21)
Not retained	1.01 (.54–1.87)	2.26c (1.59–3.21)

Abbreviations: CI, confidence interval; HR, hazard ratio; IOM, Institute of Medicine.

^aCovariates include site, age, race/ethnicity, sex, human immunodeficiency virus transmission risk group, and pre–antiretroviral therapy CD4⁺ cell count and viral load.

^bThe IOM measure defines retention as having ≥2 kept (attended) primary care visits separated by ≥90 days during a 12-month period.

^c P < .001.