Table 1.

Operating time according to number of the cases in 2 phases of learning curve

Phase 1 patients’ number	Operating time (min)	Phase 2 patients’ number	Operating time (min)
1	387	10	310
2	353	11	267
3	365	12	317
4	350	13	290
5	371	14	315
6	368	15	290
7	545	16	330
8	448	17	320
9	365	18	289
		19	280
		20	300