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

Gayet-Ageron et al. BMC Medical Research Methodology 2010 10:93   doi:10.1186/1471-2288-10-93

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