Group performance on the Battelle Developmental Inventory overall was 66.4 ± 4.3 (mean 100 ± 15). Between 75% and 100% of the cohort performed at least 1.5 SD below the normative mean on the ...

using the Battelle Developmental Inventory, scored well below the norm across all domains assessed. Group means for the cohort were consistently more than 1.5 SD below the normative mean ...