Table 1 PICOS statement for inclusion and exclusion criteria

Study population

Schizophrenia patients, regardless of their age, sex, ethnic group or disease status.

Any not listed in the inclusion criteria

Intervention

Amisulpride in any oral form of application with any dose

Any not listed in the inclusion criteria

Comparator

Olanzapine in any oral form of application with any dose

Any not listed in the inclusion criteria

Outcome measures

Clinical efficacy outcomes

Safety outcome

Any not listed in the inclusion criteria

Study design

RCTs with head-to-head comparison

Editorials OR Notes OR Comments OR Letters OR Case reports OR Pharmacokinetic studies OR Epidemiology studies

Restrictions

Full-text published manuscripts in English or Chinese

Year limitation: no limit

Duplicates

Not full-text published manuscripts

Non-English or non-Chinese studies