Correction

Sample size requirements for case-control study designs: correction

Michael deBurgh Edwardes

Division of Clinical Epidemiology, Royal Victoria Hospital, 687 Pine Ave W, Ross 4.21, Montreal, Quebec H3 A 1A1 Canada

author email corresponding author email

BMC Medical Research Methodology 2002, 2:16doi:10.1186/1471-2288-2-16

The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2288/2/16

Received:	9 December 2002
Accepted:	12 December 2002
Published:	12 December 2002

© 2002 Edwardes; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.

Correction

1. Add the phrase "within each stratum" to the last sentence in the section preceding the section titled "Interaction". In the PDF version this is at line 5 in the first column of page 4. The whole sentence should read: "Consequently, it is not required that F controls be linked with each case, only that the total number of controls be F times the total number of cases within each stratum."

2. In the discussion section, EGRET SIZ is mentioned, and it is suggested that input for such a program which computes sample size for logistic regression would probably be simpler than input for DESIGN or DAYSMITH. In fact, EGRET SIZ performs the calculations only for categorical confounders, and requires input for each category, so it does not currently appear to require simpler input.

References

1. Edwardes MD: Sample Size Requirements for Case-Control Study Designs.

   BMC Medical Research Methodology 2001., 1(11):PubMed Abstract | Publisher Full Text | PubMed Central Full Text

Pre-publication history

The pre-publication history for this paper can be accessed here:

http://www.biomedcentral.com/1471-2288/2/16/prepub

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