Table 3. Comparison of ranking time characteristics between ATP top 50 and top 51–100 Athletes.

	Top 50	Top 51–100	T	Z	P
Age	26.34±4.98	27.10±3.43		-1.709	0.087
Age start training(years)	4.76±0.27	5.34±0.23		-2.019	0.044*
Age start ranking(years)	17.70±0.22	18.44±0.21		-2.750	0.006**
Time to top 100(months)	29.28±2.29	59.06±3.32	-29.780		0.000**
Age to top 100	20.12±0.30	23.44±0.39		-5.744	0.000**