Colin R. Martin
The Tokophobia Severity Scale (TSS): measurement model, power and sample size considerations
Martin, Colin R.; Jones, Catriona; Huang, Chao; Jomeen, Julie; Boubert, Laura; Marshall, Claire A.
Dr Catriona Jones C.Jones@hull.ac.uk
Senior Lecturer: Maternal Mental Health
Dr Chao Huang C.Huang@hull.ac.uk
Senior Lecturer in Statistics
Claire A. Marshall
Objective: To examine the measurement model of the Tokophobia Severity Scale and consider issues of statistical power and sample size from the original instrument development study. Background: Fear of childbirth (FoC) and tokophobia represents an area of increasing concern within perinatal mental health research and clinical practice. Existing measures of the FoC have been criticised due to either measurement inconsistencies, difficulties in scoring or practical clinical application. Attempting to address these limitations, researchers developed the Tokophobia Severity Scale (TSS). A fundamental assumption underpinning the use of the TSS is unidimensionality, however this assertion may have been based on sub-optimal sample size and approach taken to factor structure determination. Method: Parallel analysis (PA), principal components analysis (PCA), exploratory factor analysis (EFA), power analysis and sample size calculation using a reconstruction of the original dataset from published summary data. Results: Following replication of the original PCA, a three-factor model was found to offer a significantly better fit to data than a unidimensional model. Power analysis suggested the original study was underpowered. Conclusion: The TSS remains a promising tool but assumptions regarding its measurement model are based on an inadequate sample size. Sample sizes for a sufficiently powered study indicated.
Martin, C. R., Jones, C., Huang, C., Jomeen, J., Boubert, L., & Marshall, C. A. (in press). The Tokophobia Severity Scale (TSS): measurement model, power and sample size considerations. Journal of reproductive and infant psychology, https://doi.org/10.1080/02646838.2021.1931070
|Journal Article Type||Article|
|Acceptance Date||May 8, 2021|
|Online Publication Date||Jun 9, 2021|
|Deposit Date||May 28, 2021|
|Publicly Available Date||Jun 10, 2022|
|Journal||Journal of Reproductive and Infant Psychology|
|Peer Reviewed||Peer Reviewed|
|Keywords||Childbirth; Emotional; Psychosocial factors; Quantitative methods; Mother/s|
This file is under embargo until Jun 10, 2022 due to copyright reasons.
Contact K.Radford@hull.ac.uk to request a copy for personal use.
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