Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults
Abstract Background Food literacy is theorised to improve diet quality, nutrition behaviours, social connectedness and food security. The definition and conceptualisation by Vidgen & Gallegos, consisting of 11 theoretical components within the four domains of planning and managing, selecting, pr...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2022-09-01
|
| Series: | International Journal of Behavioral Nutrition and Physical Activity |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s12966-022-01351-8 |
| _version_ | 1798037305582157824 |
|---|---|
| author | Courtney Thompson Rebecca Byrne Jean Adams Helen Anna Vidgen |
| author_facet | Courtney Thompson Rebecca Byrne Jean Adams Helen Anna Vidgen |
| author_sort | Courtney Thompson |
| collection | DOAJ |
| description | Abstract Background Food literacy is theorised to improve diet quality, nutrition behaviours, social connectedness and food security. The definition and conceptualisation by Vidgen & Gallegos, consisting of 11 theoretical components within the four domains of planning and managing, selecting, preparing and eating, is currently the most highly cited framework. However, a valid and reliable questionnaire is needed to comprehensively measure this conceptualisation. Therefore, this study draws on existing item pools to develop a comprehensive food literacy questionnaire using item response theory. Methods Five hundred Australian adults were recruited in Study 1 to refine a food literacy item pool using principal component analysis (PCA) and item response theory (IRT) which involved detailed item analysis on targeting, responsiveness, validity and reliability. Another 500 participants were recruited in Study 2 to replicate item analysis on validity and reliability on the refined item pool, and 250 of these participants re-completed the food literacy questionnaire to determine its test–retest reliability. Results The PCA saw the 171-item pool reduced to 100-items across 19 statistical components of food literacy. After the thresholds of 26 items were combined, responses to the food literacy questionnaire had ordered thresholds (targeting), acceptable item locations (< -0.01 to + 1.53) and appropriateness of the measurement model (n = 92% expected responses) (responsiveness), met outfit mean-squares MSQ (0.48—1.42) (validity) and had high person, item separation (> 0.99) and test–retest (ICC 2,1 0.55–0.88) scores (reliability). Conclusions We developed a 100-item food literacy questionnaire, the IFLQ-19 to comprehensively address the Vidgen & Gallegos theoretical domains and components with good targeting, responsiveness, reliability and validity in a diverse sample of Australian adults. |
| first_indexed | 2024-04-11T21:24:45Z |
| format | Article |
| id | doaj.art-3462bb459bb14b2cbe857ee9f4b3ca2e |
| institution | Directory Open Access Journal |
| issn | 1479-5868 |
| language | English |
| last_indexed | 2024-04-11T21:24:45Z |
| publishDate | 2022-09-01 |
| publisher | BMC |
| record_format | Article |
| series | International Journal of Behavioral Nutrition and Physical Activity |
| spelling | doaj.art-3462bb459bb14b2cbe857ee9f4b3ca2e2022-12-22T04:02:28ZengBMCInternational Journal of Behavioral Nutrition and Physical Activity1479-58682022-09-0119112310.1186/s12966-022-01351-8Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adultsCourtney Thompson0Rebecca Byrne1Jean Adams2Helen Anna Vidgen3Queensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition SciencesQueensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition SciencesCentre for Diet and Activity Research (CEDAR), MRC Epidemiology Unit, University of Cambridge School of Clinical MedicineQueensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition SciencesAbstract Background Food literacy is theorised to improve diet quality, nutrition behaviours, social connectedness and food security. The definition and conceptualisation by Vidgen & Gallegos, consisting of 11 theoretical components within the four domains of planning and managing, selecting, preparing and eating, is currently the most highly cited framework. However, a valid and reliable questionnaire is needed to comprehensively measure this conceptualisation. Therefore, this study draws on existing item pools to develop a comprehensive food literacy questionnaire using item response theory. Methods Five hundred Australian adults were recruited in Study 1 to refine a food literacy item pool using principal component analysis (PCA) and item response theory (IRT) which involved detailed item analysis on targeting, responsiveness, validity and reliability. Another 500 participants were recruited in Study 2 to replicate item analysis on validity and reliability on the refined item pool, and 250 of these participants re-completed the food literacy questionnaire to determine its test–retest reliability. Results The PCA saw the 171-item pool reduced to 100-items across 19 statistical components of food literacy. After the thresholds of 26 items were combined, responses to the food literacy questionnaire had ordered thresholds (targeting), acceptable item locations (< -0.01 to + 1.53) and appropriateness of the measurement model (n = 92% expected responses) (responsiveness), met outfit mean-squares MSQ (0.48—1.42) (validity) and had high person, item separation (> 0.99) and test–retest (ICC 2,1 0.55–0.88) scores (reliability). Conclusions We developed a 100-item food literacy questionnaire, the IFLQ-19 to comprehensively address the Vidgen & Gallegos theoretical domains and components with good targeting, responsiveness, reliability and validity in a diverse sample of Australian adults.https://doi.org/10.1186/s12966-022-01351-8Food literacySurveyItem response theoryRasch measurementPartial credit modelTest–retest reliability |
| spellingShingle | Courtney Thompson Rebecca Byrne Jean Adams Helen Anna Vidgen Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults International Journal of Behavioral Nutrition and Physical Activity Food literacy Survey Item response theory Rasch measurement Partial credit model Test–retest reliability |
| title | Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults |
| title_full | Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults |
| title_fullStr | Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults |
| title_full_unstemmed | Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults |
| title_short | Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults |
| title_sort | development validation and item reduction of a food literacy questionnaire iflq 19 with australian adults |
| topic | Food literacy Survey Item response theory Rasch measurement Partial credit model Test–retest reliability |
| url | https://doi.org/10.1186/s12966-022-01351-8 |
| work_keys_str_mv | AT courtneythompson developmentvalidationanditemreductionofafoodliteracyquestionnaireiflq19withaustralianadults AT rebeccabyrne developmentvalidationanditemreductionofafoodliteracyquestionnaireiflq19withaustralianadults AT jeanadams developmentvalidationanditemreductionofafoodliteracyquestionnaireiflq19withaustralianadults AT helenannavidgen developmentvalidationanditemreductionofafoodliteracyquestionnaireiflq19withaustralianadults |