tandmobRoos            package:bayesSurv            R Documentation

_S_i_g_n_a_l _T_a_n_d_m_o_b_i_e_l _d_a_t_a, _v_e_r_s_i_o_n _R_o_o_s

_D_e_s_c_r_i_p_t_i_o_n:

     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).

     This is the version of the dataset used first by Leroy et al.
     (2005) and contains a subset of the 'tandmob2'. Some children were
     removed to satisfy inclusion criteria given in Leroy et al.
     (2005). Additionally, left-censored emergence times of the
     permanent first molars are adjusted according to the eruption
     stage (see Leroy et al., 2005).

     This data set was then used in the analyses presented in Komarek
     and Lesaffre (2006, 2007).

     *IMPORTANT NOTICE:* It is possible to use these data for your
     research work under the condition that each manuscript is first
     approved by 
      Prof. Emmanuel Lesaffre 
      Biostatistical Centre Katholieke Universiteit Leuven 
      Kapucijnenvoer 35 
      B-3000 Leuven 
      Belgium 
      <'emmanuel.lesaffre@med.kuleuven.be'>

_U_s_a_g_e:

     data(tandmobRoos)

_F_o_r_m_a_t:

     a~data frame with 4\,394 rows and the following variables

     _I_D_N_R identification number of a child

     _G_E_N_D_E_R character _boy_ or _girl_

     _D_O_B character, date of birth in the format DDmmmYY

     _P_R_O_V_I_N_C_E factor, code of the province with

          _0 =  Antwerpen

          _1 =  Vlaams Brabant

          _2 =  Limburg

          _3 =  Oost Vlaanderen

          _4 =  West Vlaanderen


     _E_D_U_C factor, code of the educational system with

          _0 =  Free

          _1 =  Community school

          _2 =  Province/council school


     _G_I_R_L numeric, 0 = _boy_, 1 = _girl_

     _E_B_E_G._x_x lower limit of the emergence (in years of age) of the
          permanent tooth xx. In contrast to 'tandmob2', the lower
          emergence limit for the permanent first molars that were
          originally left-censored, are adjusted according to the
          eruption stage (see Leroy, 2005 for more details).

          xx takes values 16, 26, 36, 46 (permanent first molars).

     _E_E_N_D._x_x 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'.

     _F_B_E_G._x_x 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'.    

     _F_E_N_D._x_x 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%.

     _T_O_O_T_H._x_x numeric, 0 or 1. Equal to 1 if the information concerning
          the permanent tooth was available, 0 if the permanent tooth
          xx was removed from the dataset by Kris.

          xx takes values 16, 26, 36, 46.

          These variables are almost useless for ordinary users.

     _T_x_x_d numeric, 0 or 1. It is equal to 1 if the deciduous tooth xx
          was decayed, 0 otherwise.

          xx takes values 54, 64, 74, 84 (deciduous first molars), 55,
          65, 75, 85 (deciduous second molars).

     _T_x_x_m numeric, 0 or 1. It is equal to 1 if the deciduous tooth xx
          was missing due to caries, 0 otherwise.

          xx takes values 54, 64, 74, 84 (deciduous first molars), 55,
          65, 75, 85 (deciduous second molars).

     _T_x_x_f numeric, 0 or 1. It is equal to 1 if the deciduous tooth xx
          was filled, 0 otherwise.

          xx takes values 54, 64, 74, 84 (deciduous first molars), 55,
          65, 75, 85 (deciduous second molars).

     _T_x_x_s numeric, 0 or 1. It is equal to 1 if the deciduous tooth xx
          was sound, 0 otherwise.

          xx takes values 54, 64, 74, 84 (deciduous first molars), 55,
          65, 75, 85 (deciduous second molars).

     _S_E_A_L._x_x numeric, 0 or 1. It is equal to 1 if the permanent first
          molar xx was sealed in pits and fissures (a form of
          protection), 0 otherwise.

          xx takes values 16, 26, 36, 46 (permanent first molars).    

     _F_R_E_Q._B_R numeric, 0 or 1. It is equal to 1 if the child brushes
          daily the teeth, equal to 0 if he/she brushes less than once
          a day.

     _P_L_A_Q_U_E._x_x._1 numeric, 0 or 1. It is equal to 1 if there was
          occlusal plaque in pits and fissures of the permanent tooth
          xx. It is equal to 0 if there was either no plaque present or
          the plaque was present on the total occlusal surface.

          xx takes values 16, 26, 36, 46 (permanent first molars).     

     _P_L_A_Q_U_E._x_x._2 numeric, 0 or 1. It is equal to 1 if there was
          occlusal plaque on the total occlusal surface of the
          permanent tooth xx. It is equal to 0 if there was either no
          plaque present or the plaque was present only in pits and
          fissures.

          xx takes values 16, 26, 36, 46 (permanent first molars).    

_S_o_u_r_c_e:

     Biostatistical Centre, Katholieke Universiteit Leuven,
     Kapucijnenvoer 35, 3000 Leuven, Belgium

     'URL:' 'http://med.kuleuven.be/biostat/'

     Data collection was supported by Unilever, Belgium. The Signal
     Tandmobiel project comprises the following partners: D. Declerck
     (Dental School, Catholic University Leuven), L. Martens (Dental
     School, University Ghent), J. Vanobbergen (Oral Health Promotion
     and Prevention, Flemish Dental Association), P. Bottenberg (Dental
     School, University Brussels), E. Lesaffre (Biostatistical Centre,
     Catholic University Leuven), K. Hoppenbrouwers (Youth Health
     Department, Catholic University Leuven; Flemish Association for
     Youth Health Care).

_R_e_f_e_r_e_n_c_e_s:

     Kom&#225rek, A. and Lesaffre, E. (2007). Bayesian accelerated
     failure time model with multivariate doubly-interval-censored data
     and flexible distributional assumptions. _To appear in Journal of
     the American Statistical Association_.

     Kom&#225rek, A. and Lesaffre, E. (2006). Bayesian semi-parametric
     accelerated failurew time model for paired doubly
     interval-censored data. _Statistical Modelling_, *6*, 3-22.

     Leroy, R., Bogaerts, K., Lesaffre, E., and Declerck, D. (2005).
     Effect of caries experience in primary molars on cavity formation
     in the adjacent permanent first molar. _Caries Research_, *39*,
     342-349.

     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.

