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The aim of this study was to analyze the relative importance of bone age and chronological age in physique according to gender and to identify the relative importance of bone age, chronological age, and physique in physical fitness and motor coordination according to gender in order to alleviate the imbalance between physique and physical fitness in children. A total of 666 children(346 males, 320 females) between the ages of 11-14 were enrolled as subjects, and the skeletal maturation, which is proven and used most often as indicators of biological maturation, were measured in order to calculate the bone age. The skeletal maturation were measured by taking hand-wrist radiographs of children and were calculated in order to reflect bone maturities of each part by calculating the bone age using the TW3 method, which determines skeletal maturation. The calculation method of chronological age was done by dividing 12 months into 10 points, giving scores ranging from 0 points in December to 0.91 points in January, starting with the month of the child"s birth. A stadiometer and InBody 270(Biospace, Korea) were used to measure 8 components in physique. Physical fitness were measured through a total of 4 components: muscular strength, flexibility, muscular endurance, cardiovascular endurance; and motor coordination were measured through a total of 3 components: balance, agility, power. The data processing was performed using SPSS 25.0 with descriptive statistics, stepwise regression, and it was considered significant at the level of P< 0.05. The results of this study may be summarized as follows. First, physique variables for both males and females aged 11-14 were found to be more significant predictors of bone age than chronological age. Second, for physical fitness in males, in the order of %fat, body water, waist-hip ratio, weight, fat-free mass, and chronological age were more significant predictor variables; and in females, in the order of %fat, fat-free mass, height, chronological age, weight, bone age, fat mass, and body water were more significant predictor variables. For bone age and chronological age in physical fitness, bone age in males and chronological age in females found to be the more representative variables respectively.