aidssi {mstate} | R Documentation |
These data sets give the times (in years) from HIV infection to AIDS, SI switch and death in 329 men who have sex with men (MSM). Data are from the period until combination anti-retroviral therapy became available (1996). For more background information on the cohort, ccr5 and SI, see Geskus et al. (2000, 2003)
aidssi
contains follow-up data until the first of AIDS and SI
switch. It was used as example for the competing risks analyses in
Putter, Fiocco, Geskus (2007) and in Geskus (2016).
aidssi2
extends the aidssi
data set in three
ways. First, it considers events after the initial one. Second, it
includes the entry times of the individuals that entered the study
after HIV infection. Third, age at HIV infection has been added as
extra covariable. Numbers differ slightly from the aidssi
data
set. Some individuals were diagnosed with AIDS only when they died and
others had their last follow-up at AIDS diagnosis. In order to prevent
two transitions to happen at the same time, their time to AIDS was
shortened by 0.25 years. This data set was used as example for the
multi-state analyses in Geskus (2016).
data(aidssi) data(aidssi2)
aidssi
patnr: | Patient identification number |
time: | Time from HIV infection to first of SI appearance and AIDS, or last follow-up |
status: | Event indicator; 0 = censored, 1 = AIDS, 2 = SI appearance |
cause: | Failure cause; factor with levels "event-free", "AIDS", "SI" |
ccr5: | CCR5 genotype; factor with levels "WW" (wild type allele on both chromosomes), |
"WM" (mutant allele on one chromosome) | |
aidssi2
patnr: | Patient identification number |
entry.time: | Time from HIV infection to cohort entry. Value is zero if HIV infection occurred while in follow-up. |
aids.time: | Time from HIV infection to AIDS, or last follow-up if AIDS was not observed |
aids.stat: | Event indicator with respect to AIDS, with values 0 (censored) and 1 (AIDS) |
si.time: | Time from HIV infection to SI switch, or last follow-up if SI switch was not observed |
si.stat: | Event indicator with respect to SI switch, with values 0 (no switch) and 1 (switch) |
death.time: | Time from HIV infection to death, or last follow-up if death was not observed |
death.stat: | Event indicator with respect to death; 0 = alive, 1 = dead |
age.inf: | Age at HIV infection |
ccr5: | CCR5 genotype; factor with levels "WW" (wild type allele on both chromosomes), |
"WM" (mutant allele on one chromosome) | |
Geskus RB (2000). On the inclusion of prevalent cases in HIV/AIDS natural history studies through a marker-based estimate of time since seroconversion. Statistics in Medicine 19, 1753–1769.
Geskus RB, Miedema FA, Goudsmit J, Reiss P, Schuitemaker H, Coutinho RA (2003). Prediction of residual time to AIDS and death based on markers and cofactors. Journal of AIDS 32, 514–521.
Geskus, Ronald B. (2016). Data Analysis with Competing Risks and Intermediate States. CRC Press, Boca Raton.
Putter H, Fiocco M, Geskus RB (2007). Tutorial in biostatistics: Competing risks and multi-state models. Statistics in Medicine 26, 2389–2430.