STABILITY OF DEVELOPMENTAL DIFFERENCES IN INFANCY

The stability of developmental test results was studied in a multivari ate analysis. A sample of 139 children war tested with three multidime nsional tests (subscales of the Bayley Scales, Ordinal Scales of Senso rimotor Development, Munique Developmental Diagnosis) at the age of 8 and 15 months. Principal component analyses with varimax rotation resu lted in three interpretable factors at each age level. Correlation coe fficients between the factor values at time 1 and time 2 were highest for factors of similar content. The test results of boys and girls did not differ in factor structure or factor score means, but in the patt ern of correlation coefficients across time.