 The authors concluded that a suspect Denver II “should lead to careful monitoring and rescreening unless provider or parental concern suggests the need for immediate referral.” Among children 18–72 months old, the prevalence of abnormality was 0.43 and the positive predictive value of the Denver II was 0.77, negative predictive value of 0.89, sensitivity 0.86, and specificity of 0.81.The authors concluded that in their program a suspect Denver II should usually result in referral.