Table 3. Data for the Out-of-plane Approach.

Out of plane	Time for needle placement (Seconds)			Number of needle advances (Numbers)			Score for ultrasound view (Point)
Period	non-EMG	EMG	P value	non-EMG	EMG	P value	non-EMG	EMG	P value
1	8.14 ± 5.51	4.02 ± 1.70	0.012	2.10 ± 1.17	1.30 ± 0.29	0.092	1.40 ± 0.23	0.70 ± 0.32	<.001
2	5.74 ± 3.39	3.10 ± 1.25	0.021	1.58 ± 0.75	1.24 ± 0.37	0.293	1.26 ± 0.40	0.58 ± 0.15	0.001
3	5.42 ± 3.65	2.66 ± 1.12	0.023	1.44 ± 0.85	1.02 ± 0.06	0.111	1.26 ± 0.41	0.72 ± 0.19	0.001
4	4.38 ± 2.79	2.46 ± 1.07	0.04	1.18 ± 0.37	1.02 ± 0.06	0.121	1.28 ± 0.27	0.64 ± 0.26	<.001
5	4.18 ± 2.08	2.34 ± 0.89	0.03	1.20 ± 0.25	1.14 ± 0.13	0.839	1.56 ± 0.21	0.44 ± 0.13	<.001
6	3.80 ± 2.05	2.24 ± 1.09	0.035	1.10 ± 0.14	1.00 ± 0.00	0.03	1.20 ± 0.23	0.32 ± 0.14	<.001

Results are expressed as mean ± SD. P values as compared two groups in each period.