title: [Accuracy of body mass index derived from self-reported height and weight in a spanish sample of children].
abstract: BACKGROUND
  In the children obesity research field, weighing and measuring involves high research costs, which could be reduced if the self-reported body mass index (BMI) was ascertained to be a valid index.
  
  
  OBJECTIVE
  To analyze the accuracy of children's selfreported BMI.
  
  
  METHODS
  171 school students from Madrid participated in the study (Mean age: 10,68 years). They were weighed and measured, and were also asked to report their weight and height. Both current and selfreported BMI were calculated.
  
  
  RESULTS
  The correlation between self-reported BMI and the current BMI was r = .803 (p < .001), and the kappa indexex ranged from k = .38 to .46.
  
  
  CONCLUSIONS
  The self-reported BMI noticeably coincide with the current BMI in 10 to 11 year-old children. However, a modest concordance was found between the categorization within a weight-related group (normal, overweight and obese) based on both indexes, which shows the former could be a valid measure when carrying out population studies on obesity and overweight.
authors.affiliation: Universidad a Distancia de Madrid (Udima). Departamento de Psicología. España.. ignaciobaile@hotmail.com.
authors.forename: José I
authors.initials: JI
authors.lastname: Baile
authors.affiliation: Universidad a Distancia de Madrid (Udima). Departamento de Psicología. España..
authors.forename: María J
authors.initials: MJ
authors.lastname: González-Calderón
mesh_terms: D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D050177:Overweight; D015203:Reproducibility of Results; D057566:Self Report; D012647:Self-Assessment; D013030:Spain