Lidocaine injection of pericranial myofascial trigger points in the treatment of frequent episodic tension-type headache

Table 2 Comparison of the data of visual analogue scale belonging to all groups before and after treatment

		G1	G2	G3	G4	* p value
VAS before treatment	N	27	27	27	27	0.9664
	Mean	71.5	70.4	70.7	71.1
	SD	7.6	8.4	6.9	10.2
	Minimum	60	55	60	50
	Maximum	85	85	85	85
VAS for 2 months after treatment	Mean	68.0	59.8	66.1	48.5	< 0.0001
	SD	9.0	13.6	8.6	13.7
	Minimum	50	35	50	20
	Maximum	85	80	85	80
	Comparison	G1 vs G2	G1 vs G3	G2 vs G4	G3 vs G4
	p value	^a 0.0121	^a 0.4431	^a 0.0037	^a <0.0001
VAS for 4 months after treatment	Mean	69.8	64.1	69.3	55.6	< 0.0001
	SD	6.6	10.9	6.3	11.5
	Minimum	50	40	50	40
	Maximum	80	80	80	80
	Comparison	G1 vs G2	G1 vs G3	G2 vs G4	G3 vs G4
	p value	^a 0.0232	^a 0.7527	^a 0.0075	^a <0.0001
VAS for 6 months after treatment	Mean	70.2	68.9	69.6	58.7	< 0.0001
	SD	6.7	7.3	6.2	12.7
	Minimum	50	55	50	30
	Maximum	80	85	80	80
	Comparison	G1 vs G2	G1 vs G3	G2 vs G4	G3 vs G4
	p value	^a 0.4987	^a 0.7533	^a 0.0007	^a 0.0002

N: Number of patients, SD: Standard deviation, * One-way Analysis of Variance (ANOVA), ^a Unpaired t test. VAS: Visual Analogue Scale. If p value obtained by ANOVA is <0.05, p values of between groups (G1,G2,G3 and G4) are compared.

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