https://search.dev.ndltd.org/etd/massey/oai:mro.massey.ac.nz:10179/7875
type: CreativeWork
name: Development and validation of the New Zealand women's healthy diet index : a thesis presented in partial fulfilment of the requirements for the degree of Masters of Science in Nutrition and Dietetics at Massey University, Albany, New Zealand
description: Background: Diet quality indices represent an alternative approach to assessing associations between diet, health, and disease. At present, there is no simple, valid, food-based diet quality index to reflect the adherence of young women to national dietary guidelines in New Zealand Aim: To develop and validate a healthy diet index to assess diet quality and adherence of young women to the Eating and Activity Guidelines for New Zealand Adults (EAGNZA). Method: Dietary information was obtained from young women (n=110) aged 19 – 45 years who completed the New Zealand Women’s Food Frequency Questionnaire (NZWFFQ). Data from the NZWFFQ was used to develop the New Zealand Women’s Healthy Diet Index (NZW-HDI). Participants also completed a four-day weighed food record (FR), which was used to validate the index. Relative validity was evaluated by comparing the NZW-HDI total scores derived from the NZWFFQ against the NZW-HDI derived from the FR. Paired t-tests, Pearson’s correlation coefficients, cross-classification, and weighted kappa were used to assess relative validity. Construct validity of the NZW-HDI was determined using nutrient intakes from the FR and Spearman’s correlation coefficients and linear contrast analysis. Results: Participants achieved an average total score of 76.7 ± 0.9 for the NZW-HDI derived from the NZWFFQ and 75.2 ± 11.1 derived from the FR. For relative validity, a significant correlation between total scores from the NZWFFQ derived NZW-HDI and the FR derived NZW-HDI (r = 0.29; P < 0.05) was found. Cross-classification of participants showed 50% were classified into the same tertile, and 16% were grossly misclassified into opposite tertiles. The weighted ĸ-statistic found both methods had fair agreement in ranking the NZW-HDI total score (ĸ = 0.244). For construct validity, the NZW-HDI total score was significantly and positively related to dietary fibre (0.227), vitamin C (0.214), folate (0.286), and calcium intakes (0.277), and inversely related…
abstract: Background: Diet quality indices represent an alternative approach to assessing associations between diet, health, and disease. At present, there is no simple, valid, food-based diet quality index to reflect the adherence of young women to national dietary guidelines in New Zealand Aim: To develop and validate a healthy diet index to assess diet quality and adherence of young women to the Eating and Activity Guidelines for New Zealand Adults (EAGNZA). Method: Dietary information was obtained from young women (n=110) aged 19 – 45 years who completed the New Zealand Women’s Food Frequency Questionnaire (NZWFFQ). Data from the NZWFFQ was used to develop the New Zealand Women’s Healthy Diet Index (NZW-HDI). Participants also completed a four-day weighed food record (FR), which was used to validate the index. Relative validity was evaluated by comparing the NZW-HDI total scores derived from the NZWFFQ against the NZW-HDI derived from the FR. Paired t-tests, Pearson’s correlation coefficients, cross-classification, and weighted kappa were used to assess relative validity. Construct validity of the NZW-HDI was determined using nutrient intakes from the FR and Spearman’s correlation coefficients and linear contrast analysis. Results: Participants achieved an average total score of 76.7 ± 0.9 for the NZW-HDI derived from the NZWFFQ and 75.2 ± 11.1 derived from the FR. For relative validity, a significant correlation between total scores from the NZWFFQ derived NZW-HDI and the FR derived NZW-HDI (r = 0.29; P < 0.05) was found. Cross-classification of participants showed 50% were classified into the same tertile, and 16% were grossly misclassified into opposite tertiles. The weighted ĸ-statistic found both methods had fair agreement in ranking the NZW-HDI total score (ĸ = 0.244). For construct validity, the NZW-HDI total score was significantly and positively related to dietary fibre (0.227), vitamin C (0.214), folate (0.286), and calcium intakes (0.277), and inversely related…
author: Fenner, Andrea
keywords: Nutrition surveys, Women, Nutrition, New Zealand
date published: 2015
date modified: 2026-07-27T20:18:16Z
provider: Massey University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Massey University