title: Development and psychometric evaluation of a health questionnaire on back care knowledge in daily life physical activities for adolescent students.
abstract: The most relevant musculoskeletal problems are related with back health. Study instruments have been designed for adult patient population but not for school-aged children. The aim of this study was to develop and evaluate the psychometric properties of a questionnaire to assess adolescents' level of back care knowledge in daily life physical activities.
  
  
  
  Participants were 171 adolescents from secondary schools. The questionnaire was made up of 24 questions. A Delphi method was used for test validation. Cronbach's alpha, test-retest, Wilcoxon signed-rank and Bland-Altman graph were used to evaluate the instrument reliability.
  
  
  
  Cronbach's alpha (α = 0.82) showed a strong internal consistency. Test-retest was excellent for total score (0.76) and moderate to excellent (0.54-0.76) for seven score conceptual categories with good results of standard error of the mean and minimal detectable change. No differences were found between test 1 and test 2 except for the standing posture scores.
  
  
  
  The questionnaire showed acceptable psychometric values. Results showed that this questionnaire is a good instrument to assess adolescent's back care knowledge.
authors.affiliation: Department of Physical Education Teacher Training, University of Valencia, Valencia, 46022, Spain. manuel.monfort@uv.es.|Facultat de Magisteri, Universitat de, València, Avd. Tarongers 4, 46022, Valencia, Spain. manuel.monfort@uv.es.
authors.forename: M
authors.initials: M
authors.lastname: Monfort-Pañego
authors.affiliation: Department of Physical Education Teacher Training, University of Valencia, Valencia, 46022, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Molina-García
authors.affiliation: Department of Physical Education Teacher Training, University of Valencia, Valencia, 46022, Spain.
authors.forename: V
authors.initials: V
authors.lastname: Miñana-Signes
authors.affiliation: Department of Physical Education Teacher Training, University of Valencia, Valencia, 46022, Spain.
authors.forename: A H
authors.initials: AH
authors.lastname: Bosch-Biviá
authors.affiliation: Department Language and Literature Teaching, University of Valencia, 46022, Valencia, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Gómez-López
authors.affiliation: Section of Physical Education and Sports, Department of Sport and Computer Science, Faculty of Sport, Pablo de Olavide University, 41013, Seville, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Munguía-Izquierdo
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D001416:Back Pain / Q000517:prevention & control*; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D011594:Psychometrics; D015203:Reproducibility of Results; D013030:Spain; D011795:Surveys and Questionnaires
keywords: Adolescent; Back pain; Daily life physical activity; Health education; Knowledge