Table 1 Characteristics of microtia in various populations

Patients, n	Prevalence/10 000 births	Anotia, %	Isolated, %	Unilateral, %	Laterality	Sex ratio	Aural atresia or stenosis, %	Other clinical abnormalities, %	Familial, %	Origin of patients	Ref.
80	17.4	—	85	93	67% R	—	—	—	15	Quito, Ecuador	2
175	3.2	—	66	90	60% R	—	—	—	—	South America	2
294		—		61	70% R	64% M	—	45	—	Chicago, USA	7
172	1.5	—	66	85	57% R		—	44	—	Italy	14
954	0.8	45	68	—	—	—	—	—	—	Central/eastern France	4
	2.4	9	67	—	61% R	M>F	—	—	—	Sweden
	2	2	50	—	—	—	—	—	—	California, USA
592	—	—	—	91	64% R	65% M	92		3	Japan	9
38	3.8	—	—	81	R more common	63% M	—	53	15	Venezuela	5
145	—	—	—	75	52% R	60% M	55	25	34	Mexico City, Mexico	12
453	1.4	—	—	—	—	No sex difference	—	60	—	China	11
636	2.2	—	25	79	—	M>F	—	—	—	California, USA	8
120	3.8	8	56	80	64% R	M>F	—	—	—	Hawaii, USA	3
53	—	—	—	49	46% R	60% M	—	—	9,4	Germany	43
190	4.3	5	67	88	60% R	58% M	93	—	20	Finland	6