R: The multicenter AIDS cohort study

cd4 {timereg} | R Documentation

## The multicenter AIDS cohort study

### Description

CD4 counts collected over time.

### Format

This data frame contains the following columns:

obs

  a numeric vector. Number of observations.

id

  a numeric vector. Id of subject.

visit

  a numeric vector. Timings of the visits in years.

smoke

  a numeric vector code. 0: non-smoker, 1: smoker.

age

  a numeric vector. Age of the patient at the start of the trial.

cd4

  a numeric vector. CD4 percentage at the current visit.

cd4.prev

  a numeric vector. CD4 level at the preceding visit.

precd4

  a numeric vector. Post-infection CD4 percentage.

lt

  a numeric vector. Gives the starting time for the time-intervals.

rt

  a numeric vector. Gives the stopping time for the time-interval.

### Source

MACS Public Use Data Set Release PO4 (1984-1991). See reference.

### References

Kaslow et al. (1987), The multicenter AIDS cohort study: rational, organisation and selected characteristics of the participants. Am. J. Epidemiology 126, 310–318.

### Examples

    data(cd4)
    names(cd4)

[Package timereg version 1.9.4 Index]