Measuring behaviours for escaping from house fires: use of latent variable models to summarise multiple behaviours

G B Ploubidis, P Edwards, D Kendrick, Keeping Children Safe Study Group, Joanne Ablewhite, Penny Benford, Clare Bryan, Rose Clacy, Carol Coupland, Nicola Cooper, Toity Deave, Trudy Goodenough, Adrian Hawkins, Mike Hayes, Paul Hindmarch, Bryony Kay, Benita Laird-Hopkins, Gosia Majsak-Newman, Elaine McColl, Lisa McDaid, Richard Reading, Jane Stewart, Alex J Sutton, Elizabeth Towner, Michael Watson, Persephone Wynn, G B Ploubidis, P Edwards, D Kendrick, Keeping Children Safe Study Group, Joanne Ablewhite, Penny Benford, Clare Bryan, Rose Clacy, Carol Coupland, Nicola Cooper, Toity Deave, Trudy Goodenough, Adrian Hawkins, Mike Hayes, Paul Hindmarch, Bryony Kay, Benita Laird-Hopkins, Gosia Majsak-Newman, Elaine McColl, Lisa McDaid, Richard Reading, Jane Stewart, Alex J Sutton, Elizabeth Towner, Michael Watson, Persephone Wynn

Abstract

Background: This paper reports the development and testing of a construct measuring parental fire safety behaviours for planning escape from a house fire.

Methods: Latent variable modelling of data on parental-reported fire safety behaviours and plans for escaping from a house fire and multivariable logistic regression to quantify the association between groups defined by the latent variable modelling and parental-report of having a plan for escaping from a house fire. Data comes from 1112 participants in a cluster randomised controlled trial set in children's centres in 4 study centres in the UK.

Results: A two class model provided the best fit to the data, combining responses to five fire safety planning behaviours. The first group ('more behaviours for escaping from a house fire') comprised 86% of participants who were most likely to have a torch, be aware of how their smoke alarm sounds, to have external door and window keys accessible, and exits clear. The second group ('fewer behaviours for escaping from a house fire') comprised 14% of participants who were less likely to report these five behaviours. After adjusting for potential confounders, participants allocated to the 'more behaviours for escaping from a house fire group were 2.5 times more likely to report having an escape plan (OR 2.48; 95% CI 1.59-3.86) than those in the "fewer behaviours for escaping from a house fire" group.

Conclusions: Multiple fire safety behaviour questions can be combined into a single binary summary measure of fire safety behaviours for escaping from a house fire. Our findings will be useful to future studies wishing to use a single measure of fire safety planning behaviour as measures of outcome or exposure.

Trial registration number: NCT 01452191. Date of registration 13/10/2011.

Trial registration: ClinicalTrials.gov NCT01452191.

Figures

Fig. 1
Fig. 1
Standardised factor loadings and standard errors of confirmatory factor analysis with two dimensions f1 and f2. *f1 and f2circles are latent continuous dimensions. **“e” circles represent random error in each observed indicator, or unique variance not shared with other indicators of fire safety related behaviour
Fig. 2
Fig. 2
Histogram of dimensional safety behaviour summary index (f1)

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Source: PubMed

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