GBA1 and dementia: Subgroup analysis for GBA mutations based on dementia diagnostic criteria showed the following RRs: DSM-IV criteria (RR = 1.78, 95% CI: 1.56–2.02, p < 0.00001, I2 = 0%), MDS criteria (RR = 1.65, 95% CI: 1.23–2.23, p = 0.0010, I2 = 72%), CDR criteria (RR = 2.25, 95% CI: 1.48–3.44, p = 0.0002, I2 = 0%), and MMSE criteria (RR = 2.02, 95% CI: 1.44–2.82, p < 0.0001, I2 = 18%).