Table 2. Primary information for the four polymorphisms included in this study^a.

Gene	Ch. location	rs number	Base change	Functional consequence	MAFb	Ref
IL1B	2q14	rs4848306	G>A	upstream variant	0.48	[15]
TNF	6p21.3	rs1800629	G>A	upstream variant	0.08	[16]
PPARG	3p25	rs1801282	C>G	missense, intron variant	0.06	[17]
PPARGC1A	4	rs3774921	T>C	intron variant	0.32	[18]

Abbreviations: Ch, chromosome; MAF, minor allele frequency.

^aData were obtained from the NCBI dbSNP database (http://www.ncbi.nlm.nih.gov/projects/SNP).

^bMinor allele frequency in the controls of this study.