tandmob2              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 _2

_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 data set was used in the analyses presented in Komarek et al.
     (2005), in Lesaffre, Komarek, and Declerck (2005) and in Komarek
     and Lesaffre (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(tandmob2)

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

     a~data frame with 4\,430 rows (38 sampled children did not come to
     any of the designed dental examinations) and the following
     variables

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

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

     _G_E_N_D_E_R_N_u_m numeric, 0 = _boy_, 1 = _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


     _S_T_A_R_T_B_R factor, code indicating the starting age of brushing the
          teeth (as reported by parents) with

          _1 =  [0, 1] years

          _2 =  (1, 2] years

          _3 =  (2, 3] years

          _4 =  (3, 4] years

          _5 =  (4, 5] years      

          _6 =  later than at the age of 5      


     _F_L_U_O_R binary covariate, 0 = no, 1 = yes. This is the covariate
          _fluorosis_ used in the paper Komarek et al. (2005).

     _B_A_D._x_x 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).

     _E_B_E_G._x_x 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).

     _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_x_x._D_M_F indicator whether a deciduous tooth xx was _*d*ecayed_ or
          _*m*issing due to caries_ or _*f*illed_ 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).

     _T_x_x._C_A_R 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. 

_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., Lesaffre, E., Harkanen, T., Declerck, D., and
     Virtanen, J. I. (2005). A Bayesian analysis of multivariate
     doubly-interval-censored dental data. _Biostatistics,_ *6*,
     145-155.

     Kom&#225rek, A. and Lesaffre, E. (2007). Bayesian accelerated
     failure time model for correlated interval-censored data with a
     normal mixture as an error distribution. _Statistica Sinica,_
     *17*, 549-569. 

     Lesaffre, E., Kom&#225rek, A., and Declerck, D. (2005). An
     overview of methods for interval-censored data with an emphasis on
     applications in dentistry. _Statistical Methods in Medical
     Research_, *14*, 539-552.

     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.

