Table 1.
Variables and Variable Classification Used in Propensity Models as Potential Confounders of the Relationship Between Enrollment in the Human Immunodeficiency Virus Care Coordination Program and the Outcome of Viral Suppression, New York City, 2018
| Variable | Classification | Detail |
|---|---|---|
| Sex | Male, female | |
| Race | Black, Hispanic, white, other | |
| Age at HIV diagnosis, years | ≤24, 25–44, 45–64, ≥65 | |
| Country of birth | United States or United States dependency, foreign-born, unknown | |
| Transmission risk | Men who have sex with men, heterosexual, injection drug use, other/unknown | |
| Year of HIV diagnosis | Prior to 1995, 1995–1999, 2000–2004, 2005–2009, 2010–2013 | For persons who were newly diagnosed (within 1 year of the pseudoenrollment or enrollment date), year of diagnosis was categorized as 2009–2010, 2011, or 2012–2013. |
| Baseline viral load | No viral load, ≤200 copies/μL, 201–1,500 copies/μL, >1,500 copies/μL | Based on the last viral load reported before the pseudoenrollment or enrollment date. |
| Baseline CD4+ lymphocyte count | No CD4, <200, 200–349, 350–499, ≥500 | Based on the last CD4 count reported before the pseudoenrollment or enrollment date. |
| Linkage within 91 days of HIV diagnosis | Yes, no | A viral load or CD4 count or CD4% reported from 0–7 days after diagnosis did not indicate linkage. |
| Concurrent AIDS diagnosis within 365 days | Yes, no | AIDS diagnosis reported within 365 days of HIV diagnosis. |
| Number of viral load laboratory events at enrollment | 0, 1–3, ≥4 | Number of viral load values reported in the 12 months before pseudoenrollment or enrollment date. |
| Prevalence and poverty at enrollment | High poverty and high prevalence, low poverty and high prevalence, high poverty and low prevalence, low poverty and low prevalence, unknown | Poverty was based on the level of poverty in the zip code at enrollment according to the American Community Survey and was classified as high versus low. Prevalence was based on the HIV prevalence in the zip code at enrollment and was classified as high (prevalence greater than the median HIV prevalence for a given year of enrollment) versus low. |
| Zip code at enrollment | New York City zip codes | |
| Interaction terms: | Baseline CD4 and viral load, baseline CD4 and race, sex and risk, and year of diagnosis and risk |
Abbreviations: AIDS, acquired immune deficiency syndrome; HIV, human immunodeficiency virus.