Summary estimates for the OR of Apo E porlymorphism in various allele/genotype contrasts: overall analysis and subgroup analyses.

ε2 carriers indicates ε2/ε2+ε2/ε3 genotypes and ε4 carriers indicates ε4/ε4+ε3/ε4 genotypes. Apo E, apolipoprotein E; Q, Q-statistic; OR, odds ratio; CI, confidence interval; HW-E: Hardy–Weinberg equilibrium; PB: population based; HB: hospital based; HTG: hypertension glaucoma; NTG: normal tension glaucoma; PCR: polymerase chain reaction; RFLP restriction fragment length polymorphisms.aCochran's chi-square Q statistic test used to assess the heterogeneity in subgroups.bZ test used to determine the significance of the overall OR.