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.
Authors
Catriona Jones
Dr Chao Huang C.Huang@hull.ac.uk
Senior Lecturer in Statistics
Julie Jomeen
Laura Boubert
Claire A. Marshall
Abstract
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.
Citation
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 | Mar 29, 2024 |
Journal | Journal of Reproductive and Infant Psychology |
Print ISSN | 0264-6838 |
Electronic ISSN | 1469-672X |
Publisher | Routledge |
Peer Reviewed | Peer Reviewed |
DOI | https://doi.org/10.1080/02646838.2021.1931070 |
Keywords | Childbirth; Emotional; Psychosocial factors; Quantitative methods; Mother/s |
Public URL | https://hull-repository.worktribe.com/output/3774848 |
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Copyright Statement
©2021 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder
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