Skip to main content
. 2017 Jun 1;8:15493. doi: 10.1038/ncomms15493

Table 1. Characteristics of the twin study sample.

  ASD discordant twin pairs (N=20 individuals)* ASD concordant twin pairs (N=12 individuals) Non-ASD twin pairs (N=44 individuals)
Gestational week 34.7±4.6 34.7±1.5 36.0±3.5
Age at assessment 14.7±3.9 11.5±3.0 13.0±3.1
No. females: males 8:12 4:8 18:26
No. MZ:DZ twin pairs 3:4 5:1 9:10
  ASD twin Co-twin    
Average birth weight in grams (±s.d.) 2,116.6±872.6 2,207.7±773.1 2,492.7±495.7 2,433.7±761.5
ADOS-2 severity score 4.1±1.8 2.2±2.2 6.1±2.8 2.0±1.6
SRS-2 total raw score 74.1±28.6 32.3±25.4 98.7±16.2 41.9.±32.3
Full scale Intelligence Quotient 93.1±19.0 104.2±11.1 85.4±21.1 99.0±15.3

ADOS-2, The Autism Diagnostic Observation Schedule Second Edition; ASD, autism spectrum disorder; DZ, dizygotic; MZ, monozygotic; SRS-2, Social Responsiveness Scale Second Edition.

*Six singletons.

Six singletons.

Singletons excluded.

Data are from 32 full twin pairs and 12 singletons from twin pairs that have participated in the RATSS study.

HHS Vulnerability Disclosure