. 2017 Nov 8;7:15035. doi: 10.1038/s41598-017-14778-y

Table 1.

Numbers of GWAS samples and SNPs after quality control.

Phenotype	Case			Control¹			Genotyped SNP
Phenotype	Sample	Male	Female	Sample	Male	Female	Genotyped SNP
IONFH	1,547	777	770	59,103	32,135	26,968	525,308
*Stratified analysis based on risk factors* ²
Steroid-associated	1,058	386	672	59,103	32,135	26,968	525,264
Alcohol-associated	351	316	35	59,103	32,135	26,968	524,775
Neither-associated	132	70	62	59,103	32,135	26,968	523,825
*Stratified analysis based on alcohol intake* ³
Alcohol-associated	351	316	35	3,647	3,349	298	525,254

¹Derived from BioBank Japan. ²Six patients could not be classified because sufficient information for classification could not be obtained. ³Controls were matched for alcohol-drinking history (400 ml or more ethanol consumption per week). IONFH: idiopathic osteonecrosis of the femoral head.