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Table 3 Patients (%) with global perceived effect on pain in the four arms of treatment and totals for the two treatments.

From: Randomised controlled trial of gabapentin in Complex Regional Pain Syndrome type 1 [ISRCTN84121379]

Treatment period GBP-1= Placebo-1= Wash-out= GBP-2= Placebo-2=
% some improvement (n) 45% (10) 13% (3) 1 8% (2) 13% (3)
% much improvement (n) 14% (3) 5% (1) 0 21% (5) 4% (1)
% total (n/N) 59% (13/22) a 17% (4/24) 1 29% (7/24) 18% (4/22)
= Total = GBP = = Total = placebo = = =
% some improvement 26% (12/46)   13% (6/46)   
% much improvement 17% (8/46)β   4% (2/46)   
% total (n/N) 43% (20/46)a   17% (8/46)   
worsened 13% (6/46)   9% (4/46)   
  1. GBP-1 is gabapentin treatment before wash-out. GBP-2 is gabapentin treatment after wash-out. 'α' is significant, P < 0.005, 'β' is P < 0.10 McNemar two sided tested gabapentin versus placebo.