The University of Southampton
University of Southampton Institutional Repository

Development and Preliminary Validation of the Food Intolerance Quality of Life Questionnaire (FIQLQ): Adult form

Development and Preliminary Validation of the Food Intolerance Quality of Life Questionnaire (FIQLQ): Adult form
Development and Preliminary Validation of the Food Intolerance Quality of Life Questionnaire (FIQLQ): Adult form
Background:

Approximately 20% of children and adults avoid certain foods because of perceived food intolerance. Valid and reliable health-related quality of life instruments are needed to measure changes following clinical, therapeutic or policy interventions. However, there are no disease-specific quality of life instruments for adults with food intolerances.

Objective:

To develop the Food Intolerance Quality of Life Questionnaire FIQLQ. Then to conduct psychometric validation including reliability and construct validity.

Methods:

We adapted the existing Food Allergy Quality of Life questionnaire (FAQLQ) for interviews with 14 adults with food intolerance. For preliminary psychometric validation, 229 adults with food intolerances completed the online electronic version of FIQLQ.

Results:

The resultant FIQLQ had 18 items which loaded onto 3 subscales—Emotional Impact, Social and Dietary Restrictions, Reactions and Avoidance. Each subscale had excellent internal consistency reliability (Cronbach’s α 0.81–0.94). Content, convergent and construct validity was supported by significant correlations of FIQLQ subscale scores with hypothesised variables including age, numbers of symptoms and level of stress experienced due to intolerance.

Conclusion:

The FIQLQ has good reliability, construct validity and internal consistency. It is short and easy to use, providing a good tool for evaluating quality of life in the clinical research setting and to inform health and regulatory policies.
0962-9343
DunnGalvin, Audrey
cb3a7df5-feb4-414a-b528-459c52dd2a80
Barnett, Julie
e075f8d9-cf31-4bfc-a6be-41988b5ce764
Began, Fiona M.
03244cab-d52a-4e80-8f5b-02d40dd051ba
Ryan, Kathleen
8053f72f-2abf-4a56-8e52-b58df1fdce91
Lucas, Jane S.
5cb3546c-87b2-4e59-af48-402076e25313
DunnGalvin, Audrey
cb3a7df5-feb4-414a-b528-459c52dd2a80
Barnett, Julie
e075f8d9-cf31-4bfc-a6be-41988b5ce764
Began, Fiona M.
03244cab-d52a-4e80-8f5b-02d40dd051ba
Ryan, Kathleen
8053f72f-2abf-4a56-8e52-b58df1fdce91
Lucas, Jane S.
5cb3546c-87b2-4e59-af48-402076e25313

DunnGalvin, Audrey, Barnett, Julie, Began, Fiona M., Ryan, Kathleen and Lucas, Jane S. (2017) Development and Preliminary Validation of the Food Intolerance Quality of Life Questionnaire (FIQLQ): Adult form. Quality of Life Research. (doi:10.1007/s11136-017-1732-0).

Record type: Article

Abstract

Background:

Approximately 20% of children and adults avoid certain foods because of perceived food intolerance. Valid and reliable health-related quality of life instruments are needed to measure changes following clinical, therapeutic or policy interventions. However, there are no disease-specific quality of life instruments for adults with food intolerances.

Objective:

To develop the Food Intolerance Quality of Life Questionnaire FIQLQ. Then to conduct psychometric validation including reliability and construct validity.

Methods:

We adapted the existing Food Allergy Quality of Life questionnaire (FAQLQ) for interviews with 14 adults with food intolerance. For preliminary psychometric validation, 229 adults with food intolerances completed the online electronic version of FIQLQ.

Results:

The resultant FIQLQ had 18 items which loaded onto 3 subscales—Emotional Impact, Social and Dietary Restrictions, Reactions and Avoidance. Each subscale had excellent internal consistency reliability (Cronbach’s α 0.81–0.94). Content, convergent and construct validity was supported by significant correlations of FIQLQ subscale scores with hypothesised variables including age, numbers of symptoms and level of stress experienced due to intolerance.

Conclusion:

The FIQLQ has good reliability, construct validity and internal consistency. It is short and easy to use, providing a good tool for evaluating quality of life in the clinical research setting and to inform health and regulatory policies.

Text
FIQLQ_Manuscript_October_2017 - Accepted Manuscript
Download (34kB)
Text
FIQLQ Tables October 2017
Download (32kB)
Text
FIQLQ Manuscript October 2017
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 27 October 2017
e-pub ahead of print date: 18 November 2017

Identifiers

Local EPrints ID: 416001
URI: https://eprints.soton.ac.uk/id/eprint/416001
ISSN: 0962-9343
PURE UUID: e33ca997-7fc3-4f00-abd7-3fc2f455369c

Catalogue record

Date deposited: 30 Nov 2017 17:30
Last modified: 10 Dec 2019 05:41

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×