. 2019 Jul 17;76(10):1035–1043. doi: 10.1001/jamapsychiatry.2019.1411

Table 1. Outcomes and Characteristics of the Analytic Sample.

Outcome	Countries					Total
Outcome	Denmark	Finland	Sweden	Israel	Western Australia	Total
Families, No.^a	183 034	160 570	262 047	37 430	37 421	680 502
Children, No.^b	528 052	472 959	753 125	131 147	116 348	2 001 631
Sex, No.
Male	270 844	241 909	388 126	67 237	59 430	1 027 546
Birth cohort
1998-2002	270 564	240 984	360 351	75 220^c	57 822	974 085
2003-2007	257 488	231 975	392 774	55 927^d	58 526	929 721
ASD cases, No.	7580	2968	10 563	490	555	22 156
AD cases, No.	2676	709	4303	NA	459	8147
Asperger syndrome, No.	1731	1044	3557	NA	7	6339
PDD-NOS	3173	1215	2703	NA	89	7180
Children, No.
Cousins^e	467 836	404 410	652 803	113 851	109 550	1 748 450
mPCs^f	119 257	104 218	168 524	25 052	28 899	445 950
Full siblings^g	355 099	330 948	518 762	106 893	80 394	1 392 096
ASD concordance pairs, No.
Cousins	99	10	121	4	2	236
mPCs	30	3	33	3	1	70
Full siblings	191	69	353	7	19	639

Abbreviations: AD, autistic disorder; ASD, autism spectrum disorder; mPCs, maternal parallel cousins; NA, not available; PDD-NOS, pervasive developmental disorder not otherwise specified.

^{^a}

Data were organized in unit of family based on relatedness type in the Methods section.

^{^b}

Owing to data structure requirement by the statistical modeling, replicates exist (eAppendix 2: Analytic Sample Ascertainment in the Supplement).

^{^c}

Birth cohort 2000-2005.

^{^d}

Birth cohort 2006-2011.

^{^e}

Cousins are defined as children (cousins and full siblings) in the paired cousin families.

^{^f}

mPCs is defined as children (cousins and full siblings) in the families based on maternal parallel cousin pairs.

^{^g}

Full siblings are defined as full siblings from all 4 types of families defined based on relatedness.