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Table 4 Number of patients with a positive GPE and/or a successful VAS at different times in the study (T1, T2 and T6).

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

  T1 (= 8 weeks) T2 (= 16 weeks) T6 (= 1 year)
  Group I Group II Total Group I Group II Total Group I Group II Total
n with success (%) 12 (80%) 10 (66,7%) 22 (73,3%) 10 (66,7%) 8 (53,3%) 18 (60%) 8 (53,3%) 7 (46,7%) 15 (50%)
n no success (%) 3 (20%) 4 (26,7%) 7 (23,3%) 2 (13,3%) 5 (33,3%) 7 (23,3%) 2 (13,3%) 3 (20%) 5 (16,7%)
n no data (%)   1 (6,7%) 1 (3,3%) 3 (20%) 2 (13,3%) 5 (16,7%) 5 (33,3%) 5 (33,3%) 10 (33,3%)
  1. Group I = Radiofrequency treatment group
  2. Group II = Local injection group