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. 2013 Jan 10;13:19. doi: 10.1186/1471-2458-13-19

Table 5.

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

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 Fisher’s exact test.