title: Test-retest and home-clinic characteristics of the Bayley Scales of Infant Development in nine- and fifteen-month-old infants.
abstract: This study examines the Bayley performances of 9- and 15-month-old infants tested 1 week apart in the home and clinic. Total raw scores and their equivalent Mental Development Indices were found not to be seriously affected by setting differences. Assessment of test-retest characteristics showed, however, wide variations of stability measures between age and sex. While 3 of the 4 main infant subgroups produced statistically significant coefficients of stability, only 1 (15-month-old females) achieved a level of stability comparable to that reported for short-interval repeated childhood IQ testing. Analysis of infants' performance consistencies with respect to the Bayley items revealed hidden variations possibly affecting the reliability of infant examinations.
mesh_terms: D002657:Child Development; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011581:Psychological Tests; D011594:Psychometrics; D012931:Social Environment