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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

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

  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
  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
  2. Headache difference = mean days of headache 4 weeks before T1, T2, T3 and T6 compared with mean days of headache before T0
  3. 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.
  4. Percentage VAS improving = mean VAS improved on T1, T2, T3 and T6 compared with T0 in %.