Summary of meta-analysis results in different models.

Abbreviations: N, number; AD, Alzheimer's disease; Ph, P value for heterogeneity; OR, odds ratios; CI, confidence interval; ins, insertion; del, deletion; F, fixed effects model; R, random effects model; Sensitivity-C, sensitivity analysis in Caucasians; Sensitivity-A, sensitivity analysis in Asians; Sensitivity-T, sensitivity in total populations. Bold values are statistically significant.