NA: Not applicable; BMI: Body mass index; PCR-RFLP: Polymerase chain reaction–restriction fragment length polymorphism. Study characteristics from published studies on the relation of the TNF-α-308G/A
N, number of comparisons; OR, odds ratio; CI, confidence interval; vs., versus; CC vs. TT: Homozygote comparison; CT vs. TT: Heterozygote comparison; CC/CT vs. TT: Dominant model; CC vs. CT/TT: Recess
