• M Monfort-Pañego, J Molina-García, V Miñana-Signes, A H Bosch-Biviá, A Gómez-López, and D Munguía-Izquierdo.
• Department of Physical Education Teacher Training, University of Valencia, Valencia, 46022, Spain. manuel.monfort@uv.es.
• Eur Spine J. 2016 Sep 1; 25 (9): 2803-8.

PurposeThe 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.MethodsParticipants 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.ResultsCronbach'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.ConclusionThe questionnaire showed acceptable psychometric values. Results showed that this questionnaire is a good instrument to assess adolescent's back care knowledge.

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