## 4 Discussion  
As confirmed in many cases from advanced sports countries, physical factors are essential factors in improving athletic performance [8; 9]. Objective and accurate physical examination and evaluation of physical strength related to performance improvement by sport are emphasized. In particular, efforts to explore and apply performance-related physical factors in each sport have been attempted due to the problem of specificity in each event [1; 2; 3]. Relative weighs of physical factors in each sport can be assessed quantitatively and this might be used as a useful as baseline data for selecting athletes. Nevertheless, it is not easy to see the effort needed to calculate the relative weights of each physical factor. Therefore, this study aimed to compare the importance of physical factors in each sport and calculate the relative weighs of the various physical factors. In order to achieve the purposes of the study, the sports groups were divided into four types according to the sports physiology perspective: A type: sports that focus on short-term muscular power and short-term muscular endurance, B type: sports that focus on mid-term muscular endurance, C type: sports that focus on long-term cardiorespiratory endurance and D type: sports that focus on agility, coordination capabilities, flexibility and balance. In the type A case, according to the result of our logistic regression analysis, only the power factor had a statistically significant effect on performance, and the relative weights from the Wald values were high in order power, strength, and coordination. In other words, power has the most relevance in type A sports. This is consistent with the importance of power mentioned in the studies of short-distance runners [10] and weightlifters [11] which are type A sports. [PERSON] and colleagues said that the ability to exert a sudden burst of force, or power, affects the performance of short-distance track and field athletes [10]. [PERSON] and colleagues explained that strength and power are important factors in weightlifters' performance [11]. The relative weight of coordination was 16 percent, the third highest. In this study, the data of eye-hand coordination tests was used, and eye-hand coordination is the technology that identifies visual information of the eye in the brain which responds to the motion information of the hand [12]. This means how accurate and fast an athlete reacts to visually perceived information, and in another study, it was stated that reaction time and eye-hand coordination are highly relevant [13]. In the type B case, according to the logistic regression analysis results, the factors strength, muscle endurance and power had statistically significant effects on performance, and from the the calculation of relative weights using the corresponding Wald values, the results were high in the order of factors strength, muscle endurance and power. In a related study about Type B sports, [PERSON] and [PERSON] mentioned that the ability of muscular function, average power and highest power, including muscular and muscular endurance are the main factors affecting the performance of rowers, which is believed to support the results of this study [14]. Also, [PERSON] and colleagues reported power, strength, and balance as the determinant factors [15]. The results of this study show that calculated balance factors had relatively small weights compared to the factors of strength, muscle endurance and power, and they represented the fourth highest calculated point at 9%.