Table 2.

Comparison between the fourth to fifth attempts and the sixth to seventh attempts

Value	2D start			3D start
	4th–5th	6th–7th	P value	4th–5th	6th–7th	P value
Operative time (s)
Task 1	24.1	19.5	0.086	21.9	23.7	0.218
Task 2	25.2	18.7	0.001*	21.4	29.0	0.004**
Task 3	38.2	34.8	0.239	38.4	43.5	0.120
Path length (mm)
Task 1	1419	1257	0.148	1314	1325	0.818
Task 2	1204	970	0.019*	1007	1303	0.003**
Task 3	1905	1725	0.209	1809	1944	0.229
Technical errors (times)
Task 1	1.6	0.8	0.032*	1.1	1.4	0.231
Task 2	3.1	1.4	0.027*	0.7	3.2	<0.001**
Task 3	11.9	8.0	0.021*	8.2	11.6	0.005**

* The performance in later phase was significantly better than in early phase

** The performance in later phase was significantly worse than in early phase