Table 1.

Inclusion criteria and search terms

Inclusion criteria	Criteria	Corresponding search terms
Participants	Autism spectrum disorder, younger than 8	auti* OR ASD OR PDD OR Asperger
Intervention	Behavioral or developmental intervention, excluding pharmacological or dietary components	intervention OR therapy OR teach* OR treat*
Comparison	Treatment as usual, waitlist control, general information only, or referral to other services	assign* OR “control group” OR BAU OR “wait list” OR RCT OR random* OR quasi OR “treatment group” OR “intervention group” OR “group design” OR (before AND after) OR trial
Outcome	Social communication	“commun*” or “social interact*” or “social function*” or “joint attention” or “joint engagement” or “ESCS” or “CSBS”
Study Design	Group design study, including randomized control trial and quasi experimental design
Language	English journals	La.exact(English)