At 18 months, the MCHAT and the ADOS-T were administered.
At 24 months, the MCHAT, ADOS-T, and ADI-T were administered.
He was also identified with ASD risk at 18 and 24 months using the MCHAT, ADOS-T, and ADI-T.
As stated, the only child who was diagnosed with ASD was previously identified at 18 and 24 months with the MCHAT, ADOS-T, and ADI-T.
Among the PT children only one child, who was born at 33 GA weeks, was diagnosed at 36 months with ASD based on the information received from the parents, the ADOS at 36 months, the MCHAT, ADOST, and ADI-T at 18 and 24 months, and by clinical judgment at 36 months.
As expected, parent-completed MCHAT questionnaires yielded more at risk children than the ADOS administered by trained professionals at 18 and 24 months among both PT and FT children.
So far this issue has been investigated only with parental reports, using the MCHAT questionnaire at 24 months [30, 47].
One limitation of our study is that it did not include the now available MCHAT follow-up interviews, which might have increase the specificity of the MCHAT.
Although a virtual cottage industry has developed around autism-screening instruments, the Checklist for Autism in Toddlers (CHAT) and Modified CHAT (MCHAT
) are those most tested and validated for screening.