Can developmental screening tests identify children who are developmentally at risk?

Developmental screening tests are in widespread use, but few reliable and valid tests are available. The most frequently used screening instrument for detecting young children who are at risk for developmental delays is the Denver Developmental Screening Test (DDST). Although the DDST has excellent test specificity, overreferring few children, results from more than a dozen studies of the DDST's concurrent and predictive validity fail to replicate the original validation and demonstrate a uniformly poor sensitivity, ie, a high proportion of underreferrals. Whether samples are stratified by age, risk, duration of time between predictor and outcome, or type of outcome measure used, these studies demonstrate that the DDST underrefers children at nearly a 2:1 ratio. Several other screening tests with more optimal psychometric properties are presented. It is urged that caution be exercised in using tests for predicting the risk of developmental problems in young children unless the tests have acceptable levels of sensitivity and specificity.

Is the early and periodic screening, diagnosis, and treatment program effective with developmentally disabled children?

The effectiveness of the Early and Periodic Screening, Diagnosis, and Treatment Program (EPSDT) in identifying health and developmental problems and facilitating diagnosis, treatment, and follow-up for a sample of Michigan children with moderate and severe developmental disabilities was studied. Three data sets, derived from parent reports and Medicaid records concerning 281 Medicaid-eligible, young developmentally disabled children from nine representative counties in the state were studied. Approximately 56% of these children had used EPSDT, and 44% had not. Findings from the first data base, a parent questionnaire, indicated no differences between the two groups in terms of age at diagnosis, access to routine or specialized health care, or reasons for inability to obtain needed care. The second database, the screening summaries from the EPSDT sites, contained reports on 108 children. Many of the required procedures were not performed on these children. The final data set, the Medicaid claims records, was used to assess whether appropriate medical follow-up occurred in response to the screening encounter. Only 62% of the screenings with a referral had a Medicaid visit within 1 year of screening and only half of the referrals that resulted in a follow-up visit had a diagnosis that confirmed the reason for referral. Recommendations for improving the health and developmental screening of disabled children are presented and the policy implications of these findings are discussed.

Growth and development of preterm infants with respiratory distress syndrome and bronchopulmonary dysplasia.

This study examines the growth and development of 37 preterm infants, 20 with respiratory distress syndrome and 17 with bronchopulmonary dysplasia. The groups were balanced by sex, parity, family configuration, and socioeconomic status and were studied at either 12 or 18 months after hospital discharge. Findings indicate that infants with bronchopulmonary dysplasia are at greater risk for growth retardation in their second year than infants with respiratory distress syndrome. Furthermore, results from cognitive, sensorimotor, and language measures (the Bayley, Uzgiris-Hunt, and Receptive-Expressive Emergent Language scales) demonstrate that infants with bronchopulmonary dysplasia perform significantly less well than infants with respiratory distress syndrome. The group performance of the infants with respiratory distress syndrome suggests that their developmental scores are comparable to those of average, healthy full-term infants of the same age. In contrast, the group of infants with bronchopulmonary dysplasia performed in the low-average to delayed range. Moreover, regression analyses show that type of respiratory illness explains more of the variance in cognitive outcomes than such neonatal factors as birth weight or gestational age. Thus, this study demonstrates that infants with bronchopulmonary dysplasia are at high risk for developmental problems in their second year, and that the contribution of bronchopulmonary dysplasia to explanations of differential cognitive outcomes cannot be reduced to between-group differences in perinatal status.

Cranial sonography and neurological examination at term and motor performance through 19 months of age.

This study examined the role of cranial sonography and neurological examination in the prediction of developmental progress during the first 19 months of life in extremely preterm infants. Forty-seven infants with mean birth weight 993 +/- 197 g and gestational age 27.9 +/- 1.9 weeks were studied. Each infant was classified as normal, suspect, or abnormal using cranial sonography and a structured neurological examination. Developmental outcome was assessed using the Infant Neurological International Battery (INFANIB) at 4, 8, and 14 months and the Rockford Infant Developmental Evaluation Skills (RIDES) at 19 months. Sonographic classification was the best predictor of outcome through 14 months, F(2.72) = 12.4, p < .001. The neurological examination predicted performance only at 4 months. No infant classified as normal on both examinations was abnormal on follow-up. Infants with suspect or abnormal neurological examinations had normal outcomes if their sonographic findings were normal.

Meeting the mandate of Public Law 99-457: early childhood intervention in the nineties.

The Education of the Handicapped Act Amendments of 1986 (PL 99-457) represents the most far-reaching public legislation ever enacted for disabled and developmentally vulnerable young children. This paper presents the basic requirements of the law and discusses the elements of a comprehensive system of early childhood intervention. The challenges and problems created by the law are delineated, and recommendations presented.

Time sampling: a methodological critique.

Numerous developmental studies of social behavior employ an observational technique called time sampling. This technique is used to estimate the frequencies and proportions of time that actual behaviors occur and to measure group or individual differences. By contrasting time sampling to continuous sampling, we demonstrate that (a) time sampling is inaccurate for estimating actual durations or frequencies of behavior, and (b) resulting individual and/or group differences can change depending on whether time sampling or continuous sampling is used. Error rates are particularly high when the total bout lengths of the actual behaviors are short (as in mother-infant interactions) and/or when interval length is long. Because the majority of mother and infant behaviors are short in bout length (less than 60 sec), when percent error is the greatest, we suggest that alternative sampling methods that have proven validity be used in future studies (e.g., scan, point, or continuous sampling).

Cranial sonography and neurological examination of extremely preterm infants.

Fifty-one extremely preterm infants were studied to ascertain whether there is an association between sonographic abnormalities and neurological examination at term, controlling for factors such as low birthweight and chronic lung-disease. Their mean birthweight was 956g and mean gestational age was 27.9 weeks. Sonography was performed at least once during the first week, twice within the first month, and once within a month of term-corrected age. Neurological assessment was used to classify the infants as normal, suspect or abnormal at term. Infants were divided into three groups, based on sonographic findings: group 1 (no hemorrhage), group 2 (grade 1 to 3 hemorrhage but normal sonogram or unilateral ventriculomegaly at term) and group 3 (periventricular leukomalacia, grade 4 hemorrhage or ventriculomegaly at term). On neurological examination, 23 infants were found to be normal, 15 suspect and 13 abnormal. On sonography, 27 infants were placed in group 1, 12 in group 2 and 12 in group 3. Sonographic findings and birthweight were the best predictors of the infant's performance on the neurological examination at term.