Table 1.

Demographic characteristics of the analytical sample by ASD status (N = 51,971).

	ASD (N = 40,582)	Control (N = 11,389)
Child’s year of birth
1999–2004, n (%)	5579 (13.7%)	1638 (14.4%)
2005–2009, n (%)	11,823 (29.1%)	3481 (30.6%)
2010–2014, n (%)	15,883 (39.1%)	3985 (35.0%)
2015–2019, n (%)	7297 (18.0%)	2285 (20.1%)
Gender
Female, n (%)	8430 (20.8%)	5805 (51.0%)
Male, n (%)	32,152 (79.2%)	5584 (49.0%)
Maternal age at delivery, mean (SD)	29.5 (6.0)	29.1 (5.5)
Paternal age at delivery, mean (SD)	31.8 (6.6)	31.5 (6.2)