Considering the importance
of assessing the psychometric properties of these factors, two lines of studies have emerged using: (1) confirmatory factorial
analyses and (2) exploratory factorial analyses with comparison of the psychometric properties of the derived factor with
the psychometric properties of the Lester et al. (1982) factors. To date, only two confirmatory factor analyses were reported
to evaluate the psychometric properties of the Lester factors, one with premature infants and the other in a normative
sample. Azuma, Malee, Kavanagh, and Deddish (1991) performed confirmatory factor analyses to analyze the psychometric
properties of Lester’s factors and compare them to three other data reduction models in a sample of 166 pre-term infants.
None of the four models could be confirmed, the maximum likelihood factor analysis failed to confirm Lester’s factors system
or any of the three alternative models. The authors conclude that the lack of empirical support for the Lester model could
be due to the specificities of the premature sample behavior. McCollam, Embretson, Mitchell, and Horowitz (1997) assessed
the fit of the NBAS data in a sample of 160 healthy infants to variation of the Lester factor model. Four different models of
confirmatory factor analysis were used and compared indicating that the general configuration of the Lester factors is a good
baseline for reducing the NBAS items, although some modifications are suggested.
Considering the importanceof assessing the psychometric properties of these factors, two lines of studies have emerged using: (1) confirmatory factorialanalyses and (2) exploratory factorial analyses with comparison of the psychometric properties of the derived factor withthe psychometric properties of the Lester et al. (1982) factors. To date, only two confirmatory factor analyses were reportedto evaluate the psychometric properties of the Lester factors, one with premature infants and the other in a normativesample. Azuma, Malee, Kavanagh, and Deddish (1991) performed confirmatory factor analyses to analyze the psychometricproperties of Lester’s factors and compare them to three other data reduction models in a sample of 166 pre-term infants.None of the four models could be confirmed, the maximum likelihood factor analysis failed to confirm Lester’s factors systemor any of the three alternative models. The authors conclude that the lack of empirical support for the Lester model couldbe due to the specificities of the premature sample behavior. McCollam, Embretson, Mitchell, and Horowitz (1997) assessedthe fit of the NBAS data in a sample of 160 healthy infants to variation of the Lester factor model. Four different models ofconfirmatory factor analysis were used and compared indicating that the general configuration of the Lester factors is a goodbaseline for reducing the NBAS items, although some modifications are suggested.
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