This is the dataset resulting from a longitudinal prospective dental study performed in Flanders (North of Belgium) in 1996 -- 2001. The cohort of 4\,468 randomly sampled children who attended the first year of the basic school at the beginning of the study was annualy dental examined by one of 16 trained dentists. The original dataset consists thus of at most 6 dental observations for each child.
The dataset presented here contains mainly the information on the emergence and caries times summarized in the interval-censored observations. Some baseline covariates are also included here.
For more detail on the design of the study see Vanobbergen et al. (2000).
data(tandmobAll)a data frame with 4\,430 rows (38 sampled children did not come to any of the designed dental examinations) and the following variables
identification number of a child
character boy or girl
numeric, 0 = boy, 1 = girl
character, date of birth in the format DDmmmYY
factor, code of the province with
Ant =Antwerpen
VlB =Vlaams Brabant
Lim =Limburg
OVl =Oost Vlaanderen
WVl =West Vlaanderen
factor, code of the educational system with
Free =Free school
Community =Community school
Province/council =Province/council school
factor, code indicating the starting age of brushing the teeth (as reported by parents) with
<=1 =[0, 1] years
(1,2] =(1, 2] years
(2,3] =(2, 3] years
(3,4] =(3, 4] years
(4,5] =(4, 5] years
>5 =later than at the age of 5
% \item{FLUOR}{binary covariate, 0 = no, 1 = yes. This is the covariate % \emph{fluorosis} used in the paper \eqn{\mbox{Kom\'{a}rek}}{Komarek} % et al. (2005). % } % \item{BAD.xx}{binary, indicator whether a deciduous tooth xx was % removed becaues of orthodontical reasons or not. % % xx takes values 53, 63, 73, 83 (deciduous lateral canines), % 54, 64, 74, 84 (deciduous first molars), % 55, 65, 75, 85 (deciduous second molars). % }
lower limit of the emergence (in years of age) of the
permanent tooth xx. NA if the emergence was left-censored.
xx takes values 11, 21, 31, 41 (permanent incisors), 12, 22, 32, 42 (permanent central canines), 13, 23, 33, 43 (permanent lateral canines), 14, 24, 34, 44 (permanent first premolars), 15, 25, 35, 45 (permanent second premolars), 16, 26, 36, 46 (permanent first molars), 17, 27, 37, 47 (permanent second molars).
upper limit of the emergence (in years of age) of the
permanent tooth xx. NA if the emergence was right-censored.
xx takes values as for the variable EBEG.xx.
lower limit for the caries time (in years of age, `F'
stands for `failure') of the permanent tooth xx. NA if the
caries time was left-censored.
xx takes values as for the variable EBEG.xx.
upper limit for the caries time (in years of age, `F'
stands for `failure') of the permanent tooth xx. NA if the
caries time was right-censored.
xx takes values as for the variable EBEG.xx.
Unfortunately, for all teeth except 16, 26, 36 and 46 almost all the caries times are right-censored. For teeth 16, 26, 36, 46, the amount of right-censoring is only about 25%.
indicator whether a deciduous tooth xx was decayed or missing due to caries or filled on at most the last examination before the first examination when the emergence of the permanent successor was recorded.
xx takes values 53, 63, 73, 83 (deciduous lateral incisors), 54, 64, 74, 84 (deciduous first molars), 55, 65, 75, 85 (deciduous second molars).
indicator whether a~deciduous tooth xx was removed due to the orthodontical reasons or decayed on at most the last examination before the first examination when the emergence of the permanent successor was recorded.
Vanobbergen, J., Martens, L., Lesaffre, E., and Declerck, D. (2000). The Signal-Tandmobiel project -- a longitudinal intervention health promotion study in Flanders (Belgium): baseline and first year results. European Journal of Paediatric Dentistry, 2, 87--96.
data("tandmobAll", package="icensBKL")
summary(tandmobAll)
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