TABLE 2.

Summary of autism prevalence estimates across world regions from 2012 to 2021

Region	# estimates	Sample size			ASD prevalence (/10,000)			Gender ratio				Proportion of cases with ID (%)
		IQR	Range	Median	IQR	Range	Median	IQR	Range	Median		IQR	Range	Median
Americas	30	200,737.5	465–8,129,270	54,960	82.3	11.1–250	132.3	0.7	2.7–5.3	4.3		13.2	24–47	33
Europe	31	454,113.5	1796–2,431,649	32,342	63.5	24–268	100	1.3	0.8–5.4	4.1		28.7	0–47.5	20.9
Western Pacific	22	4,236,842.3	3300–51,529,338	19,349	203.1	1.09–436	28.3	2.1	2.2–6.1	4.7		15.1	36.8–67	45.4
South‐East Asia	8	9,442.3	3964–28,070	8143	34.0	7.5–140	23.2	1.0	1.15–3	1.75		‐	‐	‐
Eastern Mediterranean	6	98,253.0	998–837,655	30,754	86.5	10–153	62.6	1.9	1.1–4.3	2.85		0	70.3–70.3	70.3
Africa	2	‐	‐	‐	‐	120–290	205	0.1	1–1.2	1.1		‐	‐	‐
All	99	323,890	465–51,529,338	31,000	119.25	1.09–436	100	1.66	0.8–6.1	4.2		21.8	0–70.3	33