Greater occipital nerve blocks in the treatment of refractory chronic migraine: An observational report of nine cases

Table 1 Clinical findings related to migraine during follow-up

Variable(baseline and follow-up results)		Mean	Std. deviation	95%CI for mean		Minimum	Maximum	P value(anova)
				Lower bound	Upper bound
Attack number per month	Baseline	20.87	4.91	16.76	24.98	10.00	25.00	< 0.001
	1st month	8.37	3.66	5.31	11.43	4.00	15.00
	2nd month	2.87	0.99	2.04	3.70	1.00	4.00
	3rd month	2.50	0.75	1.86	3.13	1.00	3.00
	6th month	8.00	1.30	6.90	9.09	6.00	10.00
The number of analgesics used per month	Baseline	24.87	4.64	20.99	28.75	15.00	30.00	< 0.001
	1st month	9.62	4.98	5.45	13.79	4.00	18.00
	2nd month	3.12	0.83	2.42	3.82	2.00	4.00
	3rd month	2.25	0.70	1.65	2.84	1.00	3.00
	6th month	8.25	1.48	7.00	9.49	6.00	10.00
Duration of attacks per month (h)	Baseline	16.00	5.39	11.48	20.51	10.00	24.00	< 0.001
	1st month	12.87	3.22	10.17	15.57	10.00	18.00
	2nd month	9.00	2.56	6.85	11.14	7.00	15.00
	3rd month	7.62	1.40	6.44	8.8	6.00	10.00
	6th month	8.50	1.51	7.23	9.76	6.00	10.00
Visual analog scale score	Baseline	8.75	0.70	8.15	9.34	8.00	10.00	< 0.001
	1st month	6.25	1.98	4.59	7.90	2.00	8.00
	2nd month	3.12	1.35	1.99	4.25	2.00	6.00
	3rd month	2.62	0.51	2.19	3.05	2.00	3.00
	6th month	5.62	1.68	4.21	7.03	3.00	7.00