## 3 Results  
### Differences of Anthropometric and Physical Fitness Measurements among Different Age Groups and Sex  
As shown in Table 2, various testing indicators among adolescent throwers aged 14-18 exhibit distinct differences. Morphological and physical fitness indicators vary to different extents among boys and girls of the same age. Height differences persist consistently (\(p<0.01\)); weight differences disappear at ages 17-18; lower limb flexibility differences vanish around ages 16-17; agility only exhibits differences at ages 17-18 (\(p<0.01\)); jumping ability consistently displays significant differences (\(p<0.01\)); FOMB and BOST differences gradually diminish at ages 16 and 17; sprint speed remains different consistently (\(p<0.01\)); and aerobic endurance differences persist throughout (\(p<0.01\)). Moreover, significant anthropometric differences were observed only among boys of different ages in Height (F = 2.88, \(p=0.038\)), Body Mass (H = 14.964, \(p=0.02\)), BMI (F = 3.208, \(p=0.025\)), and the sit and reach test (H = 8.631, \(p=0.035\)). After conducting pairwise comparison, differences in height were found for boys aged between 14-15 (\(p=0.017\)) as well as 14-16 (\(p=0.008\)); in Body Mass between ages 14-15 and 15-16 (\(p=0.01\)), as well as 14-15 and 16-17 (\(p=0.014\)); in BMI between ages 14-15 and 15-16 (\(p=0.008\)); and in the sit and reach test between ages 14-15 and 16-17 (\(p=0.033\)), as well as 14-15 and 17-18 (\(p=0.019\)). Similarly, significant differences were also found in physical fitness performance among boys of different ages, including standing long jump (H = 10.931, \(p\) = 0.012), standing triple jump (H = 16.725, \(p\) < 0.01), FOMB (H = 14.90, \(p\) = 0.002) and the hexagon agility test (H = 42.824, \(p\) < 0.001). After conducting multiple pairwise comparisons within each group, it was found that there were differences in standing long jump between ages 14-15 and 16-17, as well as between ages 14-15 and 17-18. Additionally, differences were observed in standing triple jump between ages 14-15 and 16-17, as well as between ages 14-15 and 17-18. Moreover, significant differences were found in shot put between ages 14-15 and 15-16, and differences in agility were observed between ages 14-15 and 16-17, and also 14-15 and 17-18, as well as 15-16 and 17-18. Additionally, significant differences were observed among girls of different ages in the hexagon agility test (H = 10.184, \(p\) = 0.017) and plank test (H = 8.241, \(p\) = 0.041). After conducting multiple pairwise comparisons within each group, it was found that there were differences in agility between ages 14-15 and 16-17 (\(p\) = 0.002), as well as between 15-16 and 16-17 (\(p\) = 0.044). Additionally, differences were observed in the plank hold for girls aged between 14-15 and 16-17 (\(p\) = 0.005), as well as between 15-16 and 16-17 (\(p\) = 0.002). The differences in specific strength between boys and girls in four throwing events within the same age group, and the differences within the same gender across different age groups, are shown in Figure 2. The specific strength in shot put of boys and girls aged 14-15 (\(p\) < 0.01) and 15-16 (\(p\) < 0.01) showed differences. There also differences between boys aged 14-15 and 15-16 (\(p\) = 0.020), as well as 15-16 and 16-17 (\(p\) = 0.016), and in girls aged between 14-15 and 16-17 (\(p\) = 0.025), 15-16 and 16-17 (\(p\) = 0.011), and 15-16 and 17-18 (\(p\) = 0.029). Among discus throwers, differences were found only between boys and girls aged 15-16 (\(p\) < 0.01) and 16-17 (\(p\) = 0.044). In javelin throwers, differences were found between boys and girls aged 14-15 (\(p\) < 0.01), 15-16 (\(p\) = 0.011) and 17-18 (\(p\) < 0.01). Among boys, differences were observed between ages 14-15 and 17-18 (\(p\) = 0.002), 15-16 and 17-18 (\(p\) < 0.01), and 16-17 and 17-18 (\(p\) = 0.028). However, no age differences were found among girls. In hammer throw athletes, only girls aged 14-15 and 16-17 showed differences (\(p\) = 0.014).