The purpose of this research was to examine the construct validity of scores from the Postpartum Depression Screening Scale administered to mothers of infants in a neonatal intensive care unit.
Two samples (n = 385 and n = 110) of mothers with infants in a neonatal intensive care unit in the south-central region of the United States completed the Postpartum Depression Screening Scale 2 weeks postpartum. Both samples were similar in race and education level but differed according to marital status.
Study 1 was retrospective and descriptive, whereas study 2 was prospective and descriptive.
In study 1, confirmatory factor analysis was used to evaluate the originally proposed 7-factor structure and a 1-factor model. Because of overly high correlations between 3 of the factors, a revised 5-factor model was also tested. In study 2, confirmatory factor analysis was again used to test the construct validity or goodness of fit of the 7-factor and 5-factor models.
Goodness-of-fit indices and factor pattern coefficients.
In study 1, high correlations between 3 of the factors in the 7-factor model did not converge. Thus, a 5-factor model was also tested. This model had reasonable fit: χ2= 1339.70 (550); P < 0.01; comparative fit index = 0.85; root mean square error of approximation = 0.06; and 90% confidence interval for root mean square error of approximation = 0.058 to 0.067. In study 2, confirmatory factor analysis was again used to test the construct validity or goodness of fit of the 7-factor and 5-factor models. Results for the 7-factor model indicated unacceptable fit: χ2 (539) = 959.10; P < 0.01; comparative fit index = 0.76; and root mean square error of approximation = 0.09. The 5-factor model was also poor: χ2 (550) = 992.95; P < 0.01; comparative fit index = 0.75; and root mean square error of approximation = 0.09.
Although the construct validity of the 7-factor model of the PDSS was not supported for this sample of mothers, additional factor analytic work was used to develop and provide initial validation of a 5-factor model. Future research should continue to explore the unique experiences of mothers in the NICU who experience postpartum depression.
Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City (Drs Blucker, Cherry, McCaffree, and S. R. Gillaspy, and Mss Hetherington and Kyler); Department of Psychology and Counseling, University of Central Arkansas, Conway (Dr J. A. Gillaspy); and Department of Psychology, University of Windsor, Ontario, Canada (Dr Jackson).
Correspondence: Stephen R. Gillaspy, PhD, Associate Professor, Department of Pediatrics, Section of General and Community Pediatrics, University of Oklahoma Health Sciences Center, 1200 N Phillips Ave, Suite 12400, Oklahoma City, OK 73104 (firstname.lastname@example.org).
This article is original research from the University of Oklahoma Health Sciences Center.
This authors were supported in part by a seed grant from the Section of Neonatal-Perinatal Medicine, Department of Pediatrics, University of Oklahoma Health Sciences Center, and a Mental Health Transformation Grant from the Oklahoma Department of Mental Health and Substance Abuse Services awarded from the Substance Abuse and Mental Health Service Administration.
The authors declare no conflict of interest.