title: Comparative assessment of validity and reliability of the Oral Impacts on Daily Performance (OIDP) frequency scale: a cross-sectional survey among adolescents in Davanagere city, Karnataka, India.
abstract: OBJECTIVE
  To evaluate reliability and validity of an abbreviated version of the Oral Impact on Daily Performance (OIDP) questionnaire and to analyse the interrelationship between OIDP scores, socio-demographic characteristics and oral health status among high school children in Davanagere city, Karnataka, India.
  
  
  METHODS
  This cross-sectional survey was conducted with 900 school children aged between 12 and 15. The subjects were randomly selected from six high schools. Selected subjects completed a survey instrument predesigned to measure subjective oral health indicators including the eight-item OIDP frequency scores. The study participants were clinically examined for dental caries, and they completed a self-administered questionnaire about demographic information and oral behaviours.
  
  
  RESULTS
  44% of the students reported at least one oral impact in the previous 6 months. The reliability of the instrument was measured in terms of Cronbach's alpha for the OIDP frequency. It was found to be 0.81. Eating was the most common performance affected (33%) followed by cleaning teeth (22%) and speaking (20%). The severity of impacts was low for relaxing and carrying out works.
  
  
  CONCLUSIONS
  The OIDP frequency score has acceptable psychometric properties in the context of an oral health survey among high school children of Davanagere city, Karnataka, India.
authors.affiliation: Department of Public Health Dentistry, Bapuji Dental College and Hospital, Davangere, India.
authors.forename: G V
authors.initials: GV
authors.lastname: Usha
authors.forename: H M
authors.initials: HM
authors.lastname: Thippeswamy
authors.forename: L
authors.initials: L
authors.lastname: Nagesh
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D001294:Attitude to Health; D002648:Child; D003430:Cross-Sectional Studies; D004245:DMF Index; D003729:Dental Care; D004435:Eating / Q000502:physiology; D004644:Emotions; D005260:Female; D015438:Health Behavior; D006305:Health Status Indicators; D006801:Humans; D007194:India; D008297:Male; D009909:Oral Health; D011788:Quality of Life; D015203:Reproducibility of Results; D057566:Self Report; D012904:Smiling; D012923:Social Class; D013060:Speech / Q000502:physiology; D011795:Surveys and Questionnaires; D014099:Toothbrushing