tooth {dynsurv} | R Documentation |
Tooth Data
Description
The tooth data was from a longitudinal prospective dental study performed in Flanders (Belgium) in 1996 – 2001. Every one of 4,386 randomly sampled children in the cohort was examined annually by one of 16 trained dentists, resulting at most 6 dental observations for each child. The outcome of interest was the time to emergence of permanent tooth 24, which was either interval censored (2,775, 63%) or right censored (1,611, 37%).
Format
tooth
is a data frame with 4,386 observations and 7 columns
- id:
children's id;
- left:
left censoring time;
- right:
right censoring time where infinity is coded as 999.
- sex:
gender of children (0 = boy, 1 = girl);
- dmf:
status of the primary predecessor of this tooth (0 = sound, 1 = delayed, missing or filled);
- rightInf:
right censoring time where infinity is coded as
Inf
;- rightNA:
right censoring time where infinity is coded as
NA
.
tooth.grid
is a numeric vector of grid time points.
Source
Adapted from the data set available at https://grass.upc.edu/en/software/tooth24.
References
J. Vanobbergen, L. Martens, D. Declerck, and M. Lesaffre (2000). The signal tandmobiel(r) project: a longitudinal intervention oral health promotion study in Flanders (Belgium): baseline and first year results. European Journal of Paediatric Dentistry 2, 87.
G. Gomez, M. Calle, R. Oller, and K. Langohr (2009). Tutorial on methods for interval-censored data and their implementation in R. Statistical Modeling 9(4), 259.
Examples
data(tooth)