Table 2.

Outcomes before and after the turning point for flexible ureteroscopic TFL lithotripsy

Variables	Number		Operation time, s, mean ± SD/IQR		P	Number of tissue damage, number, mean ± SD/IQR		P	Number of central visual shift, number, mean ± SD/IQR		P
	A	B	A	B		A	B		A	B
Student 1	4	6	1311.75 ± 285.3073	853.83 ± 74.4726	0.005	6.25 ± 1.7078	4.00 ± 0.6325	0.017	9.00 (6.75-12.75)	2.50 (2.00-3.75)	0.012
Student 2	4	6	1592.00 ± 284.03634	1058.33 ± 220.1133	0.010	6.50 ± 1.2910	3.83 ± 1.9408	0.044	9.00 ± 4.2426	4.50 ± 1.5166	0.041
Student 3	4	6	1195.00 ± 110.8061	899.83 ± 124.2359	0.005	7.25 ± 3.7749	2.83 ± 1.3292	0.027	9.50 ± 3.3166	4.50 ± 2.5100	0.026
Student 4	5	5	1109.60 ± 272.9200	719.80 ± 65.5225	0.031	8.80 ± 3.8341	2.60 ± 1.1402	0.008	7.00 (4.00-12.50)	2.00 (2.00-2.00)	0.005
Student 5	3	7	1619.00 ± 315.5677	878.71 ± 136.0964	0.046	10.67 ± 2.5166	6.00 ± 1.6330	0.007	12.00 (12.00-16.00)	4.00 (3.00-7.00)	0.016
Student 6	4	6	1198.25 ± 281.8716	855.50 ± 151.9826	0.036	8.75 ± 3.7749	3.50 ± 1.0488	0.011	10.00 ± 5.2281	1.50 ± 1.0488	0.046
Student 7	6	4	1127.50 ± 207.8613	708.75 ± 157.2289	0.009	5.83 ± 1.9408	3.00 ± 1.4142	0.037	5.00 (3.75-10.00)	0.50 (0.00-1.75)	0.010
Student 8	4	6	1431.00 ± 350.6546	851.17 ± 237.6623	0.014	10.00 ± 3.7417	3.83 ± 0.7528	0.004	12.75 ± 5.9090	3.17 ± 1.3292	0.004
Student 9	6	4	1062.17 ± 193.4781	595.50 ± 98.8619	0.002	7.83 ± 3.3715	2.75 ± 1.7078	0.025	10.50 ± 4.5935	2.75 ± 1.2583	0.012
Total	40	50	1229.00 (1045.75-1425.00)	817.50 (703.75-964.75)	0.000	8 (6.00-10.00)	3.5 (3.00-5.00)	0.000	9.00 (6.00-13.50)	3.00 (2.00-4.00)	0.000