. Author manuscript; available in PMC: 2013 Dec 11.

Published in final edited form as: Res Autism Spectr Disord. 2009 JULY-SEPTEMBER;3(3):10.1016/j.rasd.2008.12.004. doi: 10.1016/j.rasd.2008.12.004

Table 4. Continuous Socio-demographic Characteristics of InterRett Subjects and Families compared with the ARSD.

		ARSD	InterRett (complete)	InterRett (≥1976)
Mother's age at subject's birth	n	276	519	479
	Mean ± Std dev	28.04±5.49	29.76±5.26	30.03±5.23
	95%CI	(27.39,28.69)	(29.30,30.21)	(29.56,30.50)
	p value		<0.001^a	<0.001^a

Age of subject at questionnaire completion	n	281	987	922
	Mean ± Std dev	7.92±5.01	12.17±8.77	10.62±6.64
	95%CI	(7.33,8.51)	(11.62,12.71)	(10.19,11.05)
	p value		<0.001^a	<0.001^a

Age of subject at diagnosis	n	265	838	790
	Mean ± Std dev	4.88±3.47	5.90±5.70	4.97±3.88
	95%CI	(4.46,5.30)	(5.51,6.29)	(4.70,5.24)
	Median	3.83	4	3.5
	p value		<0.001^a	0.697^a

when compared to the ARSD