Reliability and relative validity of a food frequency questionnaire to assess food group intakes in New Zealand adolescents

Jyh Eiin Wong, Winsome R. Parnell, Katherine E. Black, Paula M L Skidmore

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Background: Due to the absence of a current and validated food frequency questionnaire (FFQ) for use in New Zealand adolescents, there is a need to develop one as a cost-effective way to assess adolescents food patterns. This study aims to examine the test-retest reliability and relative validity of the New Zealand Adolescent FFQ (NZAFFQ) to assess food group intake in adolescents aged 14 to 18 years. Methods. A non-quantitative (without portion size), 72-item FFQ was developed and pretested. Fifty-two participants (aged 14.9±0.8 years) completed the NZAFFQ twice within a two-week period for test-retest reliability. Forty-one participants (aged 15.1±0.9 years) completed a four-day estimated food record (4DFR) in addition to the FFQs to enable assessment of validity. Spearmans correlations and cross-classification analyses were used to examine relative validity while intra-class correlations were additionally used for test-retest reliability. Results: Weekly intakes were estimated for each food item and aggregated into 34 food groups. The median Spearmans correlation coefficient (SCC) between FFQ administrations was 0.71. SCCs ranged from 0.46 for fruit juice or cordial to 0.87 for non-standard milk. The median intra-class correlation coefficient (ICC) between FFQ administrations was 0.69. The median SCC between food groups from the FFQ and the 4DFR was 0.40 with the highest SCC seen for standard milk (0.70). The exact agreement between the methods in ranking participants into thirds was highest for meat alternatives (78%), but lowest for red or yellow vegetables and potatoes (27%). The mean percent of participants misclassified into extreme thirds for food group intake was 12%. Conclusions: Despite a small sample size, the NZAFFQ exhibited good to excellent short-term test-retest reliability and reasonable validity in ranking the majority of the food group intakes among adolescents aged 14 to 18 years. The comparability of the validity to that in the current literature suggests that the NZAFFQ may be used among adolescent New Zealanders to identify dietary patterns and rank them according to food group intake.

Original languageEnglish
Article number65
JournalNutrition Journal
Volume11
Issue number1
DOIs
Publication statusPublished - 2012

Fingerprint

New Zealand
Reproducibility of Results
Eating
Food
Milk
Surveys and Questionnaires
Portion Size
Solanum tuberosum
Vegetables
Sample Size
Meat
Costs and Cost Analysis

Keywords

  • Adolescents
  • Food frequency questionnaire (FFQ)
  • New Zealand
  • Reliability
  • Reproducibility
  • Validity

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

Cite this

Reliability and relative validity of a food frequency questionnaire to assess food group intakes in New Zealand adolescents. / Wong, Jyh Eiin; Parnell, Winsome R.; Black, Katherine E.; Skidmore, Paula M L.

In: Nutrition Journal, Vol. 11, No. 1, 65, 2012.

Research output: Contribution to journalArticle

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abstract = "Background: Due to the absence of a current and validated food frequency questionnaire (FFQ) for use in New Zealand adolescents, there is a need to develop one as a cost-effective way to assess adolescents food patterns. This study aims to examine the test-retest reliability and relative validity of the New Zealand Adolescent FFQ (NZAFFQ) to assess food group intake in adolescents aged 14 to 18 years. Methods. A non-quantitative (without portion size), 72-item FFQ was developed and pretested. Fifty-two participants (aged 14.9±0.8 years) completed the NZAFFQ twice within a two-week period for test-retest reliability. Forty-one participants (aged 15.1±0.9 years) completed a four-day estimated food record (4DFR) in addition to the FFQs to enable assessment of validity. Spearmans correlations and cross-classification analyses were used to examine relative validity while intra-class correlations were additionally used for test-retest reliability. Results: Weekly intakes were estimated for each food item and aggregated into 34 food groups. The median Spearmans correlation coefficient (SCC) between FFQ administrations was 0.71. SCCs ranged from 0.46 for fruit juice or cordial to 0.87 for non-standard milk. The median intra-class correlation coefficient (ICC) between FFQ administrations was 0.69. The median SCC between food groups from the FFQ and the 4DFR was 0.40 with the highest SCC seen for standard milk (0.70). The exact agreement between the methods in ranking participants into thirds was highest for meat alternatives (78{\%}), but lowest for red or yellow vegetables and potatoes (27{\%}). The mean percent of participants misclassified into extreme thirds for food group intake was 12{\%}. Conclusions: Despite a small sample size, the NZAFFQ exhibited good to excellent short-term test-retest reliability and reasonable validity in ranking the majority of the food group intakes among adolescents aged 14 to 18 years. The comparability of the validity to that in the current literature suggests that the NZAFFQ may be used among adolescent New Zealanders to identify dietary patterns and rank them according to food group intake.",
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AU - Skidmore, Paula M L

PY - 2012

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N2 - Background: Due to the absence of a current and validated food frequency questionnaire (FFQ) for use in New Zealand adolescents, there is a need to develop one as a cost-effective way to assess adolescents food patterns. This study aims to examine the test-retest reliability and relative validity of the New Zealand Adolescent FFQ (NZAFFQ) to assess food group intake in adolescents aged 14 to 18 years. Methods. A non-quantitative (without portion size), 72-item FFQ was developed and pretested. Fifty-two participants (aged 14.9±0.8 years) completed the NZAFFQ twice within a two-week period for test-retest reliability. Forty-one participants (aged 15.1±0.9 years) completed a four-day estimated food record (4DFR) in addition to the FFQs to enable assessment of validity. Spearmans correlations and cross-classification analyses were used to examine relative validity while intra-class correlations were additionally used for test-retest reliability. Results: Weekly intakes were estimated for each food item and aggregated into 34 food groups. The median Spearmans correlation coefficient (SCC) between FFQ administrations was 0.71. SCCs ranged from 0.46 for fruit juice or cordial to 0.87 for non-standard milk. The median intra-class correlation coefficient (ICC) between FFQ administrations was 0.69. The median SCC between food groups from the FFQ and the 4DFR was 0.40 with the highest SCC seen for standard milk (0.70). The exact agreement between the methods in ranking participants into thirds was highest for meat alternatives (78%), but lowest for red or yellow vegetables and potatoes (27%). The mean percent of participants misclassified into extreme thirds for food group intake was 12%. Conclusions: Despite a small sample size, the NZAFFQ exhibited good to excellent short-term test-retest reliability and reasonable validity in ranking the majority of the food group intakes among adolescents aged 14 to 18 years. The comparability of the validity to that in the current literature suggests that the NZAFFQ may be used among adolescent New Zealanders to identify dietary patterns and rank them according to food group intake.

AB - Background: Due to the absence of a current and validated food frequency questionnaire (FFQ) for use in New Zealand adolescents, there is a need to develop one as a cost-effective way to assess adolescents food patterns. This study aims to examine the test-retest reliability and relative validity of the New Zealand Adolescent FFQ (NZAFFQ) to assess food group intake in adolescents aged 14 to 18 years. Methods. A non-quantitative (without portion size), 72-item FFQ was developed and pretested. Fifty-two participants (aged 14.9±0.8 years) completed the NZAFFQ twice within a two-week period for test-retest reliability. Forty-one participants (aged 15.1±0.9 years) completed a four-day estimated food record (4DFR) in addition to the FFQs to enable assessment of validity. Spearmans correlations and cross-classification analyses were used to examine relative validity while intra-class correlations were additionally used for test-retest reliability. Results: Weekly intakes were estimated for each food item and aggregated into 34 food groups. The median Spearmans correlation coefficient (SCC) between FFQ administrations was 0.71. SCCs ranged from 0.46 for fruit juice or cordial to 0.87 for non-standard milk. The median intra-class correlation coefficient (ICC) between FFQ administrations was 0.69. The median SCC between food groups from the FFQ and the 4DFR was 0.40 with the highest SCC seen for standard milk (0.70). The exact agreement between the methods in ranking participants into thirds was highest for meat alternatives (78%), but lowest for red or yellow vegetables and potatoes (27%). The mean percent of participants misclassified into extreme thirds for food group intake was 12%. Conclusions: Despite a small sample size, the NZAFFQ exhibited good to excellent short-term test-retest reliability and reasonable validity in ranking the majority of the food group intakes among adolescents aged 14 to 18 years. The comparability of the validity to that in the current literature suggests that the NZAFFQ may be used among adolescent New Zealanders to identify dietary patterns and rank them according to food group intake.

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KW - Reproducibility

KW - Validity

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