Parents are the first to indicate concerns about their child's development in up to 80% of children with autism spectrum disorder (ASD). They often notice symptoms related to ASD around the first two years, but the average age of diagnosis is 3.5 years old. This study examined the relationships between parents' early concerns and the time lag between suspicion and diagnosis. Forty-eight Spanish-speaking families were enrolled in this study. Parents were asked about early signs that made them think that their child could possibly have ASD. Mediation analyses showed that the child's age at suspicion mediated between sibling status and the time lag between suspicion and a formal diagnosis (β = -.53, p < .01). Having another child with typical development accelerated parents' detection of ASD signs (β = -.62, p < .001). The number of social-communication concerns that parents detected mediated this relationship (β = -.28, p < .01). Parents who reported more social-communication concerns perceived these signs earlier, but have to cope with a longer time lag until diagnosis than those who reported more concerns related to restrictive and repetitive behaviors and interests, or other developmental concerns. Moreover, this relationship between concerns of ASD and the diagnoses was explained by the child's age. Training pediatricians on how to respond to parent questions and concerns could reduce the time lag between parents' concerns and diagnosis of ASD.
Keywords: Autism Spectrum Disorders; diagnosis; parents; signal detection.