title: Predictors of missing data when asking parents about their children's diet based on "Oral Health Situation of Iranian Children" Survey.
abstract: BACKGROUND
  The predictors of missing data when parents fill out questionnaire about their children's diet are not defined. The aim of this study was to evaluate predictors which affect unresponsiveness to diet questions based on " Oral Health Situation of Iranian Children" Survey carried out in 1998.
  
  
  METHODS
  A dummy variable was created as dependent variable according to responding eight questions relating to diet. Then predictors of missing data were defined using multivariable logistic regression and classification tree method. To evaluate goodness of fit of logistic regression model, sensitivity and specificity were assessed. Classification tree analysis was done by Quest growing method. Significance level was set at 0.05 in logistic regression analysis.
  
  
  RESULTS
  "Missing data" variable was marked as missing in 616 (7.2%) of questionnaires. In logistic regression model revealed that, gender, mother's education level and father's education level didn't affect "missing data" variable (P > 0.05). But, dmf index (OR = 0.94), Area of living (OR = 0.49), number of children in the family (OR = 1.19), sibling order (OR = 0.85), brushing (OR = 0.84) and visiting dentist (OR = 0.59) had statistically significant association with dependent variable (P < 0.05). Classification tree analysis showed that questionnaires related to children in urban area whose dmf index is under 5 and haven't visited dentist are predicted to have missing data more than other groups.
  
  
  CONCLUSIONS
  Area of living, dmf index, number of children in the family, sibling order, brushing and visiting dentist are significant variables for predicting the risk of missing data when asking parents about their children's diet.
authors: Arash
authors: A
authors: Shahravan
authors: Hossein
authors: H
authors: Hessari
authors: Mohammad Reza
authors: MR
authors: Baneshi
authors: Maryam
authors: M
authors: Rad
authors: Department of Epidemiology and Biostatistics, Kerman University of Medical Sciences, Kerman; Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran.
authors: Ali Akbar
authors: AA
authors: Haghdoost
mesh_terms: D002648:Child; D004245:DMF Index; D003710:Demography; D004034:Diet Surveys; D005260:Female; D006801:Humans; D007492:Iran; D008297:Male; D009909:Oral Health; D010290:Parents; D012307:Risk Factors