Table 1.

Comparison of sample characteristics for children with ASD in the birth (B) and kindergarten (K) cohorts at 10–11 years

Measure	B (n=117–145)†	K (n=78–92)†	p value
Child age in months, mean (SD)	130.9 (4.0)	129.5 (3.5)	0.010*
Male (%)	81.0	76.7	0.517
Number of children at home, mean (SD)	2.5 (1.1)	2.7 (1.3)	0.380
English main language spoken at home (%)	94.5	95.1	0.871
Indigenous (%)	4.3	5.3	0.788
Remote/very remote location (%)	0	4.3	<0.001*
Single parent family (%)	33.2	19.0	0.056
Maternal age at childbirth, mean (SD)	30.2 (5.2)	29.5 (6.6)	0.497
Paternal age at childbirth, mean (SD)	33.0 (7.0)	31.7 (7.0)	0.289
Primary caregiver did not complete high school (%)	42.2	60.4	0.010*
Child attends special school (%; teacher report)	6.6	8.6	0.590
Neighbourhood disadvantage, mean (SD)	991.0 (65.8)	993.1 (58.6)	0.814

AlL proportions are weighted and adjusted for LSAC sample design.

*p<0.05

†N reported as a range due to missing data across the outcomes of interest.

ASD, autism spectrum disorder.