Table 1. Sample summary before and after quality control (QC).

	African American				European American
Characteristic	All samplesbefore QC	Discovery setafter QC	Replication setafter QC	All Samples after QC	Replication set before QC	Replication set after QC
Cases	1487	818	455	1273	518	442
Controls	1504	908	577	1465	379	339
External Controls	180a	180	0	180	3208b	1945
Unknown Affection Status	2	0	0	0	0	0
Male	889	575	244	819	1847	1173
Female	2264	1331	768	2099	2247	1553
Unknown Gender	20	0	0	0	11	0
Total	3173	1906	1012	2918	4105	2726

^aTaken from the Illumina YRI-ASW iControlDB;

^b175 Caucasian healthy controls from the Illumina iControlDB, 1047 controls from the dbGaP GENEVA Melanoma study, and 1986 controls from the dbGAP CIDR: NGRC Parkinson’s Disease Study.