Validity of DSM-IV syndromes in preschoolers with autism spectrum disorders.

Lecavalier et al. (2011) asked if DSM-IV labels like ADHD, ODD, and mood problems fit preschoolers with autism. They tested 229 kids using parent and teacher checklists. Then they ran a confirmatory factor analysis to see if the symptoms grouped the way the DSM says they should.

The DSM-IV syndromes held up. ADHD, ODD, and mood items clustered together just like the manual predicts. Parent ratings fit the model a little better than teacher ratings.

Georgiades et al. (2011) looked at the same age group and also used factor analysis. Instead of separate DSM boxes, they found one big "emotional-behavioral-repetitive" factor and a "social-communication" factor. The two studies seem to clash, but Luc used a confirmatory test that assumes DSM boxes exist, while Stelios used an exploratory test that lets the data speak first. Both agree that preschoolers with ASD show clear emotional and behavioral patterns.

Gadow et al. (2006) had already shown DSM-IV ADHD subtypes work in kids with PDD aged 3-11. Luc narrows the window to preschoolers and adds ODD and mood, confirming the earlier ADHD finding.

Hong et al. (2021) later counted ADHD symptoms in 979 toddlers and preschoolers with ASD and found 57 % had moderate-to-high levels. Luc’s validity result gives clinicians confidence that those high scores are real, not just autism overlap.

You can trust DSM-IV labels when a preschooler with autism also shows hyperactivity, defiance, or mood swings. Use parent forms first—they line up best. If you need a quick screen, know that about half of these kids will also have ADHD-level symptoms, so plan assessments and parent training for both sets of behaviors.