Wang 2013a.

Methods	RCT
Participants	People experienced at least 1 traumatic event (most participants experienced natural disaster ‐ the 2008 Sichuan earthquake) according to DSM‐IV trauma criteria, with the latest traumatic event happening 3 to 60 months before, and most reported at least 2 PTSD symptoms on the trauma screening questionnaire. Respondents were excluded if they had insufficient reading or auditory comprehension competency in the Chinese language, insufficient Internet access time (< 360 min in 4 weeks), or acute psychotic symptoms, or if they were receiving other mental health intervention
Interventions	Chinese My Trauma Recovery (CMTR) programme (urban/unsupported sample): 50 participants Wait list (WL) (urban/unsupported sample): 44 participants
Outcomes	Primary outcome: PTSD symptoms measured with the Post‐Traumatic Diagnostic Scale (PDS) Secondary outcomes: depressive symptoms measured with Symptom Checklist 90‐Depression (SCL‐D); cognitive changes after traumatic experiences measured with Post‐Traumatic Cognitive Changes (PCC); functional impairment after trauma experiences measured by Social Functioning Impairment (SFI); and Trauma Coping Self‐Efficacy Scale (CSE) used to determine to what extent participants felt capable of coping with PTSD reactions at different assessment points
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "The participants were randomly assigned to the treatment or waiting list condition based on a computer‐generated randomisation list"
Allocation concealment (selection bias)	Unclear risk	No information provided
Blinding of participants and personnel (performance bias) All outcomes	High risk	No information is provided, but it's hard to believe that blinding of participants could have been respected in such a study design
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quote: "Assessment had been computer‐generated on a professional Chinese survey website (equals a blinded assessment)"
Incomplete outcome data (attrition bias) All outcomes	High risk	More than 20% of participants abandoned the study prematurely Study endpoint: 32/50 missing from CMTR group; 37/53 missing from WL group
Selective reporting (reporting bias)	Low risk	All outcomes are correctly reported
Therapist qualification	Unclear risk	Self‐help trauma intervention programme available on Internet and translated by study authors
Treatment fidelity	Unclear risk	No information provided
Therapist/investigator allegiance	Unclear risk	The programme was translated by study authors
Other bias	Unclear risk	Sponsorship bias cannot be ruled out