Table 2 

Mean (±SD) standardized difference in proportions and in means in superiority and noninferiority trials. 

Superiority trials 
Noninferiority trials 
P value* 



Mean (SD) 
No. 
Mean (SD) 
No. 



Standardized difference in proportions 
0.37 (0.20) 
60 
0.27 (0.12) 
86 
0.001 


Standardized difference in means 
0.56 (0.30) 
40 
0.40 (0.11) 
14 
0.006 


Standardized difference 
0.45 (0.26) 
100 
0.29 (0.13) 
100 
<0.001 


SD: standard deviation; *Student t test 

GayetAgeron et al. BMC Medical Research Methodology 2010 10:93 doi:10.1186/147122881093 