TABLE 2

Diagnostic Breakdown of Evaluation Sample

DiagnosisPositive Screens on M-CHAT+M-CHAT/F (n = 171),an (%)Potential Missed Screening Cases (n = 36), n (%)
All ASDs
 Autistic disorder44 (25.7)1 (2.8)
 PDD-NOS48 (28.1)5 (13.9)
All non-ASD disorders
 Developmental delay37 (21.6)11 (30.6)
 Developmental language disorder18 (10.5)6 (16.7)
 Other DSM-IV diagnoses5 (2.9)1 (2.8)
Developmental concerns15 (8.8)9 (25)
Typical development4 (2.3)3 (8.3)
  • a The 6 children who screened positive on a high number of items on the M-CHAT and were offered an evaluation without completing the M-CHAT/F are included in the positive screen sample.