Table 5.

Sensitivity, Specificity, and Positive Predictive Value of passive dataset after linking to active dataset

Population	Sensitivity	Specificity	Positive Predictive Value
Muscular Dystrophy
Cases with at least one in-patient ICD-9-CM code or at least two outpatient ICD-9-CM codes given in a facility in target counties where at least one of the diagnoses was made by a neurologist, geneticist, or developmental pediatrician	20.1%	96.5%	56.6%
Fragile X Syndrome
Cases with at least one in-patient ICD-9-CM code or at least two outpatient ICD-9-CM codes given in a facility in target counties	39.7%	75.0%	75.7%