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The Natsal-SF measure of sexual function: comparison of three scoring methods

Jones, KG; Mitchell, KR; Ploubidis, GB; Wellings, K; Datta, J; Johnson, AM; Mercer, CH; (2015) The Natsal-SF measure of sexual function: comparison of three scoring methods. Journal of Sex Research , 52 (6) pp. 640-646. 10.1080/00224499.2014.985813. Green open access

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Abstract

The Natsal-SF is a psychometrically-validated measure of sexual function for use in community health surveys, derived from 17 questions reflecting three components of sexual function. Scoring requires knowledge of complex statistical modelling and, given the methodological complexities, we assess the validity of two simplified scoring methods calculated using the factor loadings produced when originally modelling the Natsal-SF items. Method 1 uses these factor loadings to three decimal places while method 2 assigns whole numbers to each item based on the factor loadings. Scores from these simplified methods are compared to the original score using correlation coefficients, by comparing the distributions, and the scores of each method in a linear regression model with key variables. We found scores from the simplified methods both correlate highly with the original score, and the distributions of scores closely match. The simplified methods result in different regression coefficients for gender and relationship context, but estimate the coefficients of all other variables similarly to the original method. While the Natsal-SF should ideally be scored using latent variable modelling, the simplified methods perform well so can be used in similar contexts, increasing the utility of the Natsal-SF and enabling future studies to measure sexual function more comprehensively.

Type: Article
Title: The Natsal-SF measure of sexual function: comparison of three scoring methods
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/00224499.2014.985813
Publisher version: http://dx.doi.org/10.1080/00224499.2014.985813
Language: English
Additional information: Copyright © 2014 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Education
UCL > Provost and Vice Provost Offices > School of Education > UCL Institute of Education
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute for Global Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute for Global Health > Infection and Population Health
URI: https://discovery.ucl.ac.uk/id/eprint/1456624
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