1. Reasons for study exclusion.

Totals	Reasons	References
3	Not randomised	Malla 2000; NCT02037581; Rosenbaum 2002
2	Not community mental health	Chen 2013; Hou 2007
9	Not a specialised early intervention service	Cai 2013; Carpenter 1982; Hansen 2012; NCT01783457; NCT01936220; NCT03409393; Pan 2012; Santos 2008; Wan 2012
36	Not an extended specialised early intervention service	Alaghband‐Rad 2006; Cechnicki 2017; COAST 2004; Dai 2007; Fan 2005c; GET UP PIANO 2013; LEO; LEO‐CAT 2004; ISRCTN58681229; J‐CAP 2014; Li 2012a; Li 2012b; Linszen 1994; Linszen 2002; Linszen 2003; Linszen 2006; Linszen 2007; Liu 2012a; Li 2012b; OTP; NCT02751632; OPUS; Qi 2006; Qu 2012; RAISE; Shahrivar 2010; STEP 2012; Sun 2010; Tang 2012; Valencia 2010; Valencia 2012; Valencia 2013; Wang 2012; Sheng 2009; Zhang 2009; Zipursky 2004