Sample size requirements for case-control study designs: correction

doi:10.1186/1471-2288-2-16

BMC Medical Research Methodology

Volume 2

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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


Published:	12 December 2002

First paragraph (this article has no abstract)

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."