. Author manuscript; available in PMC: 2017 Feb 2.

Published in final edited form as: Am J Med Genet B Neuropsychiatr Genet. 2013 Mar 8;162B(3):245–252. doi: 10.1002/ajmg.b.32141

Table 1.

Demographic characteristics of study samples

	Study 1 (Stony Brook, N=476)	Study 2 (Western University, N=409)
Child Age [mean months (SD)]	42.24 (3.14)	43.20 (3.60)
Child Sex, Male [% (N)]	252 (55.0)	201 (49.1)
Child Race, Caucasian [%(N)]	487 (87.1)	371 (90.5)
Maternal Age [mean years (SD)]	36.04 (4.44)	35.30 (4.97)
Paternal Age [mean years (SD)]	38.30 (5.39)	37.22 (4.15)
Parent marital status [married, % (N)]	93.7 (524)	80.5 (330)
Maternal Employment [%(N)]	51.2 (286)	52.4 (215)
Family income [%(N)]
< $50,000	9.2 (50)	55.6 (228)
$50,000–$100,000	51.3 (287)	26.6 (109)
> $101,000	39.7 (222)	17.8 (73)
Report/interview Completion [%(N)]	85.1 (476)	99.2 (406)

Note: Stony Brook = Stony Brook University, Long Island, NY, USA; UWO = Western University, London, ON, Canada.