Research Article
Factors Affecting Age at Initial Autism Spectrum Disorder Diagnosis in a National Survey
Table 2
Multivariate linear regression of factors affecting log-transformed age at first parent concern (AOC) among 6214 individuals with ASD.
| Parameter | Raw coefficient | Converted average difference in AOC compared with reference group (in mo)* | 95% CI (in mo) | |
| Female gender | −0.08 | −0.78 | −1.33 | −0.21 | .009 | Race | | | | | | White | REF | | | | | Black/African-American | 0.17 | 1.94 | 0.36 | 3.77 | .015 | Multiracial | −0.07 | −0.74 | −1.77 | 0.45 | — | Other | 0.04 | 0.38 | −0.72 | 1.60 | — | Hispanic Ethnicity | 0.14 | 1.56 | 0.58 | 2.63 | .001 | Initial diagnosis | | | | | | Autistic disorder | REF | | | | | PDD-NOSa | 0.05 | 0.55 | −0.03 | 1.15 | .060 | Asperger Syndrome | 0.25 | 2.93 | 2.00 | 3.95 | < .001 | Other ASD | −0.01 | −0.08 | −0.75 | 0.66 | — | Presence of IDb | −0.13 | −1.27 | −1.79 | −0.72 | < .001 | Firstborn | 0.10 | 1.03 | 0.54 | 1.56 | < .001 | High riskc | −0.32 | −2.82 | −3.35 | −2.25 | < .001 | History of autistic regression | 0.06 | 0.58 | 0.03 | 1.18 | .042 |
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Adjusted by age. Note —: , statistical nonsignificance.
aPDD-NOS: Pervasive Developmental Disorder-Not Otherwise Specified.
bID: Intellectual disability/mental retardation.
cHigh risk: history of prematurity and/or seizures and/or cerebral palsy.
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