The Age at Diagnosis of Autism Spectrum Disorder in Children in Japan

Table 4

Annual trends in age (years) at ASD diagnosis.

Year	Mean ± SD	Median	for difference
		(25–75%ile)	2009	2010	2011	2012	2013
2009	7.8 ± 4.3	7.0 (4.0–11.0)	—	NS	NS
2010	8.2 ± 4.3	8.0 (4.0–12.0)	—	—
2011	7.5 ± 4.5	7.0 (3.0–11.0)	—	—	—	NS
2012	7.1 ± 4.6	5.0 (3.0–11.0)	—	—	—	—	NS
2013	6.3 ± 4.3	4.0 (3.0–9.0)	—	—	—	—	—

Note. Kruskal-Wallis test ; Pairwise Kruskal-Wallis test; NS: not significant; ; .