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Table 2 Sample size estimates for GWAS of diabetic retinopathy with power estimates for the individual sites and with combined data

From: The eMERGE Network: A consortium of biorepositories linked to electronic medical records data for conducting genomic studies

eMERGE site Estimated number of diabetic retinopathy cases and controls Power for GWAS, p < 10-8, MAF = .10 OR = 2.5
Marshfield 367/569 .424
Northwestern 150/1262 .243
Mayo 83/3412 .101
Group Health 324/667 .449
Vanderbilt 260/500 .270
Combined 1184/6410 .999