The presence of a subthreshold autism spectrum is associated with greater prevalence of mental disorders in parents of children with autism spectrum disorders

Abstract

Introduction

Autism spectrum disorders (ASD) are highly heritable and first degree relatives (especially fathers) of autistic probands have been shown to often manifest a set of subthreshold autistic features. It is not known, however, the clinical significance of this subthreshold autism spectrum.

Objectives

– to evaluate the prevalence of a subthreshold autism spectrum respectively in fathers and mothers of children with ASD;

– to describe clinical correlates of parents with and without a subthreshold autism spectrum respectively.

Methods

36 fathers and 39 mothers of preschoolers with ASD were administered the autism-spectrum quotient (AQ), the adult autism subthreshold spectrum (AdAS spectrum), the trauma and loss spectrum (TALS), the SCID-5 and the social and occupational functioning assessment scale (SOFAS).

Results

Fathers and mothers did not differ for both AQ and AdAS spectrum total and subscale scores. Overall, 13 parents (17.3%) scored higher than 45 on the AdAS spectrum, as indicative of the presence of a subthreshold autism spectrum. This group showed greater prevalence of mood, anxiety and feeding/eating disorders, greater utilization of antidepressants and higher scores on the TALS and the SOFAS than the group scoring lower than 45 (all P < 0.05).

Conclusions

Fathers and mothers of children with ASD show autistic traits in equal measure. The presence of a subthreshold autism spectrum is associated to greater prevalence of mood, anxiety and feeding/eating disorders, to greater susceptibility to traumatic events and to lower levels of functioning.

Disclosure of interest

The authors have not supplied their declaration of competing interest.