The importance of diet and nutrition during preconception age is a window of opportunity to promote future parental and transgenerational health. As a sub-study to a large Norwegian study, ‘Diet today – health of tomorrow’, a food-frequency questionnaire (FFQ) was developed to assess diet during the preconception phase in young adults aged 20 – 30 years and in this paper we report the reproducibility and relative validity of this questionnaire. The FFQ was developed from an existing FFQ validated in adolescents. Participants were recruited on social media and at a university. Reproducibility was assessed by comparing the test and retest of the FFQ. Relative validity was assessed by comparing intake measured by the FFQ with a 7-day weighed food record. Energy, nutrients and food intake were used to assess the reproducibility and relative validity of the FFQ. The study applied the Spearman’s rank correlation coefficient, percentage of agreement and Cohen’s Kappa to assess reproducibility and validity. There were 32 participants recruited to the study, of which 21 participants completed both the test-retest reproducibility and the relative validation. The test-retest reproducibility had a median correlation coefficient of 0.85 for energy and nutrients, a median Spearman’s rank correlation coefficient of 0.75 and a median Cohen’s Kappa of 0.51 for food groups. The relative validity of the FFQ had a median correlation coefficient of 0.59 for energy and nutrients, a median Spearman’s rank correlation coefficient of 0.54 and a median Cohen’s Kappa of 0.28 for food groups. This newly developed FFQ for preconception diet in young adults had a satisfactory test-retest reproducibility and fair relative validity.

中文翻译：

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用于评估孕前饮食的新开发的基于网络的食物频率问卷的可重复性和相对有效性

孕前时期饮食和营养的重要性是促进未来父母和跨代健康的机会之窗。作为一项大型挪威研究“今天的饮食 - 明天的健康”的子研究，我们开发了一份食物频率问卷 (FFQ)，以评估 20 至 30 岁年轻人在孕前阶段的饮食，在本文中，我们报告此问卷的可重复性和相对有效性。FFQ 是从在青少年中验证的现有 FFQ 发展而来的。参与者是在社交媒体和大学招募的。通过比较 FFQ 的测试和重新测试来评估再现性。通过比较 FFQ 测量的摄入量与 7 天称重的食物记录来评估相对有效性。活力，营养素和食物摄入量用于评估FFQ的可重复性和相对有效性。该研究应用 Spearman 等级相关系数、一致性百分比和 Cohen 的 Kappa 来评估可重复性和有效性。该研究招募了 32 名参与者，其中 21 名参与者完成了重测重现性和相关验证。重测重复性的能量和营养素的中位相关系数为 0.85，食物组的 Spearman 等级相关系数中位数为 0.75，Cohen 的 Kappa 中位数为 0.51。FFQ 的相对有效性对能量和营养素的中位相关系数为 0.59，对食物组的 Spearman 等级相关系数中位数为 0.54，Cohen 的 Kappa 中位数为 0.28。