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Table 5 Socioeconomic class (based on the ABEP scale), stratified by study phase (N=80)

From: Motives for participating in a clinical research trial: a pilot study in Brazil

Socioeconomic class Phase I (n=40) Phase III (n=40)  
  n (%) n (%) p-value1
A 0 (0) 0 (0) < 0.0005
B 11 [25] 4 [10]  
C 28 (70) 24 (60)  
D 1 (2.5) 9 (22.5)  
E 0 (0) 3 (7.5)  
  1. 1Fisher’s exact test.