Li 2013a.

Methods	Allocation: randomised Blinding: not addressed Location: China Length of follow‐up: 8 weeks
Participants	Diagnosis: schizophrenia (CCMD‐3) N = 118 Sex: 62 M, 56 F Age: 19 ‐ 60 years Included: Further description of illness not reported. Excluded: Participants with cerebrovascular disease or severe physical disorder were excluded. Pregnant or breast feeding females were also excluded.
Interventions	1. CBT group*: N = 60 Content: Ziprasidone was titrated from 20 ‐ 40 mg/d to 80 ‐ 120mg/d, taken orally Cognitive therapy was conducted to help the participant correct his or her wrong beliefs or thinking process; establish and intensify the right cognition. Delivered by: not reported Frequency: not reported Treatment duration: 8 weeks 2. Standard care group: N = 58 Content: ziprasidone, no more details Delivered by: not reported Frequency: not reported Treatment duration: 8 weeks
Outcomes	Mental state: general, positive symptoms, negative symptoms, affective symptoms (PANSS scores) Engagement with services: refusing treatment
Notes	*Participants in the CBT group also received the standard care intervention.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Participants were randomly assigned..." (p.111). Comments: insufficient information about the sequence generation process to permit judgement of 'Low risk' or 'High risk'
Allocation concealment (selection bias)	Unclear risk	Comments: The method of concealment was not described.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Comments: The author did not address this information. However, participants and personnel were not likely to be blinded because participants in the treatment group received CBT, and the control group only received standard care.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comments: The method of blindness was not described.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comments: The author did not describe the dropouts. However from the reported data, there was no attrition.
Selective reporting (reporting bias)	Low risk	Comments: All measured outcomes were reported.
Other bias	Low risk	Comments: none obvious