Table 2.

Comparison of Studied Variables Within Each Group as a Before-After of Injection.

Variables a		Time		Difference	P value
		Before	After		Within-group effect b	Between-groups effect
DSL (ms)	Distal	4.9 ± 1.2	4.4 ± 0.7	0.4 ± 0.8	.001	.35 c
	Proximal	4.4 ± 0.7	4.2 ± 0.7	0.2 ± 0.3	.002
Amp-s (µv)	Distal	15.7 ± 11	18.3 ± 9.6	−2.7 ± 4.3	.001	.08 c
	Proximal	24.2 ± 10.8	23.5 ± 10.2	0.7 ± 8	.67
NCV-s (m/s)	Distal	37.6 ± 7.2	40.6 ± 5.6	−3 ± 4.2	.001	.27 d
	Proximal	42.1 ± 6.9	44.1 ± 6.4	−2 ± 3.4	.005
DML (ms)	Distal	5.4 ± 1	4.6 ± 0.8	0.7 ± 0.7	< .001	.12 c
	Proximal	5 ± 0.9	4.5 ± 0.8	0.5 ± 0.6	< .001
Amp-m (mv)	Distal	8.7 ± 2.8	8.1 ± 2.3	0.6 ± 2.3	.21	.44 d
	Proximal	9 ± 3	9 ± 3.7	0 ± 3	.72
NCV-m (m/s)	Distal	50.4 ± 5	50.4 ± 4.6	0 ± 3.3	.94	.05 c
	Proximal	52.3 ± 4	50.2 ± 5	2.1 ± 5.2	.008
Severity	Distal	2 ± 0.2	1.8 ± 0.6	0.2 ± 0.6	.06	.34 c
	Proximal	1.8 ± 0.4	1.5 ± 0.9	0.4 ± 0.7	.01
Boston 1	Distal	15.8 ± 5.4	13.6 ± 6.2	2.2 ± 4.7	.02	.52 d
	Proximal	17.1 ± 7.2	13.9 ± 6.1	3.2 ± 6.9	.01
Boston 2	Distal	27.1 ± 7.7	19.1 ± 7.2	8 ± 7.7	< .001	.79 d
	Proximal	28.3 ± 8.4	20.9 ± 10.1	7.4 ± 10	< .001
VAS	Distal	6.5 ± 1.7	3.7 ± 1.9	2.8 ± 2.1	< .001	.98 c
	Proximal	6.8 ± 1.8	4.1 ± 2.5	2.7 ± 2.7	< .001
Power (kg)	Distal	40.9 ± 15.9	46.6 ± 16.1	−5.7 ± 12.3	.02	.47 c
	Proximal	44.2 ± 20.4	48.4 ± 21.3	−4.2 ± 6.7	.002

Note. DSL = distal sensory latency; NCV-s = sensory conduction velocity; NCV-m = motor conduction velocity; VAS = visual analog scale.

^aIndicated as mean ± standard deviation.

^bWilcoxon Signed Ranks Test.

^cMann-Whitney U test.

^dt test.