Fig 1.
Study selection flow chart.
Table 1.
Characteristics of the included studies.
Fig 2.
Forest plots to compare the combination therapy with the monotherapy: Cognitive functions.
Fig 3.
Forest plots to compare the combination therapy with the monotherapy: BPSD.
Fig 4.
Forest plots to compare the combination therapy with the monotherapy: global functions.
Table 2.
Subgroup analysis results of study outcomes.
Table 3.
Adverse event and risk ratio of the combination treatment primary outcomes in Alzheimer disease (endpoint).