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Development, validity and reliability of a questionnaire designed to evaluate rapid weight loss patterns in judo players
Author(s) -
Artioli G. G.,
Scagliusi F.,
Kashiwagura D.,
Franchini E.,
Gualano B.,
Junior A. L.
Publication year - 2010
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.2009.00940.x
Subject(s) - intraclass correlation , rank correlation , cronbach's alpha , wilcoxon signed rank test , discriminant validity , athletes , reliability (semiconductor) , spearman's rank correlation coefficient , convergent validity , weight loss , physical therapy , psychology , test (biology) , mann–whitney u test , medicine , clinical psychology , psychometrics , statistics , internal consistency , mathematics , obesity , paleontology , power (physics) , physics , quantum mechanics , biology
The aim of this study was to develop a questionnaire to evaluate rapid weight loss patterns of competitive judo players and to assess its validity and reliability. We evaluated the reliability ( n =94), content validity (evaluation by 10 experts), discriminant validity (differences in scores between athletes with body weight below and above their weight class; n =100) and convergent validity (correlation with Restraint Scale; n =60). No item was considered unclear or ambiguous by more than 20% of the experts. The intraclass Coefficient Correlation was above 0.90 for all questions whose answers were parametric ( P <0.001; n =94) and no significant differences were found between test and retest scores ( n =94 – Wilcoxon's signed rank test). Cronbach's α was 0.98 for scores obtained between test and retest. Non‐numerical questions showed proportions of agreement >80%; Spearman's Correlation between the Restraint Scale and the Rapid Weight Loss Questionnaire was 0.62 ( P <0.001; n =60). Athletes below their weight class ( n =50) had a significantly lower score compared with athletes above the weight class ( n =50; P <0.001 – Mann–Whitney U test). In conclusion, the questionnaire showed good validity and reliability and could be used accurately to assess weight loss patterns of judo players.