R: Subset of variables from the CHAIN project

CHAIN {mi} | R Documentation

## Subset of variables from the CHAIN project

### Description

The CHAIN project was a longitudinal cohort study of people living with HIV in New York City, which was recruited in 1994 from a large number of medical care and social service agencies serving HIV in New York City. This subset of data pertain to the sixth round of interviews.

### Usage

    data(CHAIN)

### Format

A `data.frame` with 532 observations on the following 8 variables.

`log_virus`

  log of self reported viral load level, where zero represents an undetectable level.

`age`

  age at time of the interview

`income`

  annual family income in 10 intervals

`healthy`

  a continuous scale of physical health with a theoretical range between 0 and 100 where better health is associated with higher scale values

`mental`

  a binary measure of poor mental health ( 1=Yes, 0=No )

`damage`

  ordered interval for the CD4 count, which is an indicator of how much damage HIV has caused to the immune system

`treatment`

  a three-level ordered variable: 0=Not currently taking HAART (Highly Active AntiretRoviral Therapy) 1=taking HAART but nonadherent, 2=taking HAART and adherent

### Details

A missing value in the log virus load level was assigned to individuals who either could not recall their viral load level, did not have a viral load test in the six month preceding the interview, or reported their viral loads as "good" or "bad".

### Source

http://cchps.columbia.edu/research.cfm

### References

Messeri P, Lee G, Abramson DA, Aidala A, Chiasson MA, Jones JD. (2003). “Antiretroviral therapy and declining AIDS mortality in New York City”. Medical Care 41:512–521.

[Package mi version 1.0 Index]