Randomised controlled trial of cervical radiofrequency lesions as a treatment for cervicogenic headache [ISRCTN07444684]

Table 3 VAS, quantity of days of headache and intensity of headache at different timesin the study (T1, T2, T3 and T6) compared with T0

	RF (Group I) Mean (SD)	Control (Group II) Mean (SD)	p	95% CI
VAS difference
T1-T0	30,5 (17,3)	32,4 (24,7)	0,81	-14,4 to 18,3
T2-T0	29,9 (13,8)	21,0 (35,5)	0,41	-31,2 to 13,5
T3-T0	28,9 (20,3)	24,6 (35,0)	0,69	-26,6 to 17,9
T6-T0	30,2 (12,4)	26,8 (37,7)	0,75	-25,8 to 19,1
Headache difference
T0 T1	4,2 (5,1)	5,5 (8,7)	0,62	-4,3 to 7,1
T0 T2	4,1 (4,1)	3,9 (6,3)	0,94	-4,5 to 4,2
T0 T3	7,5 (7,1)	4,5 (6,1)	0,27	-8,3 to 2,4
T0 T6	5,6 (5,7)	6,8 (7,7)	0,65	-4,2 to 6,7
Intensity difference
T0 T1	1,5 (4,0)	- 0,5 (8,7)	0,43	-3,1 to 7,1
T0 T2	2,3 (4,2)	-1,0 (9,6)	0,23	-2,2 to 8,9
T0 T3	3,1 (4,5)	- 0,6 (9,2)	0,18	-1,8 to 9,2
T0 T6	3,7 (8,7)	- 0,4 (9,4)	0,24	-2,9 to 10,9
Percentage VAS improving
T1	43,9 (22,0)	42,4 (28,6)	0,87	-21,2 to 18,1
T2	45,4 (23,9)	24,1 (50,1)	0,17	-52,0 to 9,5
T3	41,7 (28,5)	28,0 (49,4)	0,38	-45,0 to 17,6
T6	44,4 (16,8)	30,7 (49,9)	0,34	-43,5 to 16,1

VAS difference = mean difference of VAS on T1, T2, T3 and T6 compared with T0 in mm mean VAS is the mean VAS of one week (three times a day) before T1, T2, T3 or T3
Headache difference = mean days of headache 4 weeks before T1, T2, T3 and T6 compared with mean days of headache before T0
Intensity difference of headache = mean days of heavy pain intensity 4 weeks before T1, T2, T3 and T6 compared with heavy pain intensity before T0.
Percentage VAS improving = mean VAS improved on T1, T2, T3 and T6 compared with T0 in %.

ISSN: 1471-2253