title: [Validity and reliability of self-report instruments for measuring physical activity in adolescents: a systematic review].
abstract: This was a systematic review of studies on the reliability and validity of self-report instruments for measuring physical activity, or subjective measurements, in adolescents (10-18 years). Searches were conducted in databases (MEDLINE, PsycInfo, SportsDiscus, Scopus, Web of Science, SciELO, Lilacs) and in the references of the retrieved articles. Sixty-six studies met the inclusion criteria. The majority were from North America, with only 5 from Brazil. Fifty-two different instruments were identified: 42 questionnaires, 6 diaries or logs, and 4 interviews. "Test-retest" reliability varied from 0.20 to 0.98; the majority (28/50) of the coefficients showed values < 0.70. Validity coefficients showed wide variation (-0.13 to 0.88), with the majority (64/84) < or = 0.50. Only 3 instruments displayed correlations > or = 0.70. Various instruments were tested in adolescents, especially questionnaires. These instruments generally showed better "test-retest" reliability than validity.
authors.affiliation: Departamento de Educação Física, Universidade Federal da Paraíba, João Pessoa, Brasil. jcazuzajr@hotmail.com
authors.forename: José Cazuza de
authors.initials: JC
authors.lastname: Farias Júnior
authors.forename: Adair da Silva
authors.initials: Ada S
authors.lastname: Lopes
authors.forename: Alex Antonio
authors.initials: AA
authors.lastname: Florindo
authors.forename: Pedro C
authors.initials: PC
authors.lastname: Hallal
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D015203:Reproducibility of Results; D012647:Self-Assessment; D011795:Surveys and Questionnaires / Q000145:classification* / Q000592:standards*; D055815:Young Adult