کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5122043 | 1486869 | 2017 | 7 صفحه PDF | دانلود رایگان |
BackgroundDesigning a simple and accessible approach to age estimation in children and youth is a great challenge in the fields of sports and physical activity (PA). This study was designed to develop and validate a physical-examination-based method of estimating age in young children.MethodsIn a cross-sectional study conducted in 2014, we performed physical examinations and assessed PA among 14,970 elementary school children 7-12 years old in Shanghai, China. Additional biological information on the children's height and birth date was ascertained through their parents. Two indicators were applied to develop a gender-specific age estimation equation: The percentage of predicted mature height (PPMH) and the Tanner stage. The equation was validated through a k-fold cross-validation approach. To check for estimation accuracy, the association between the discrepancy of estimated age (EA) and chronological age and PA was examined.ResultsThe gender-specific equations of EA were as follows: EAboyâ=â-6.071â+â6.559 Tanner 2â+â13.315 Tanner 3â+â14.130 Tanner 4â+â0.190 PPMH - 0.071 Tanner 2âÃâPPMH - 0.146 Tanner 3âÃâPPMH - 0.155 Tanner 4âÃâPPMH; EAgirlâ=â-4.524 - 1.251 Tanner 2â+â2.504 Tanner 3â+â8.752 Tanner 4â+â11.893 Tanner 5â+â0.158 PPMH + 0.017 Tanner 2âÃâPPMH - 0.024 Tanner 3âÃâPPMH - 0.087 Tanner 4âÃâPPMH - 0.118 Tanner 5âÃâPPMH. The mean absolute error was 0.60 years for boys and 0.59 years for girls. The discrepancy score was negatively and weakly associated with self-reported moderate-to-vigorous PA in both genders (rboyâ=â-0.09, pâ<0.001; rgirlâ=â-0.12, pâ<0.001).ConclusionFindings suggest that physical examinations could provide a valid and reliable approach for estimating age in young Chinese children.
Journal: Journal of Sport and Health Science - Volume 6, Issue 3, September 2017, Pages 352-358