The prevalence of อาการหลงผิด (delusion) in AD across the 34 studies reporting on 10,526 persons ranged from 9% to 59%. The overall pooled prevalence of อาการหลงผิด (delusion) was 31% (95% CI 27–35%), with a substantial ความไม่เหมือนกัน (heterogeneity) (I2 = 95.9%, P < 0.05) across individual studies (Supplementary Fig. 6). Then we conducted meta-regression analyses, which indicated that factors of age (p = 0.01), population origin (p = 0.029) และ duration (p = 0.012) could significantly explain some of the variance in the estimates (Table 1).