Comparison of Power Estimation of Unmatched Case Control study to other public software programs.

 

Date last tested: 7/11/05.

 

CI%, n1, p1,

n2, p2

Data input

95%, 100, 20%,

200, 10%1

 

95%, 100, 10%,

 200, 20%

95, 474, 45%,

255, 35.29%

95, 474, 35.29%,

255, 45%

 

software

Power

 

Power with continuity correction

Power

 

Power with continuity correction

Power

 

Power with continuity correction

 

Power

 

Power with continuity correction

 

OpenEpi

 

65.78%

59.26%

60.09%

52.65%

72.12%

69.32%

72.67%

69.93%

PEPI

65.78%

59.25%

 

60.09%

52.5%

72.12%

69.32

72.66%

69.93%

EPI 505

65.8%

NA

60.08%

NA

72.03%

NA

72.58%

NA

Confidence interval CI; number of cases ‘n1’;  percent of exposure among cases ‘p1’; number of controls ‘n2’;  percent of exposure among controls ‘p2’.

 

Reference:

·         PEPI: Abramson JH and Gahlinger PM (2001). Computer program for epidemiologists: PEPI version 4.0. Sagebrush Press, Salt Lake City. Used POWR.EXE version 4.0.

·         Epidemiology 505 - Emory University  (version - 11 October 2000)