Validity and reproducibility of an iodine-specific food frequency questionnaire to estimate dietary iodine intake in older Australians
Validity and reproducibility of an iodine-specific food frequency questionnaire to estimate dietary iodine intake in older Australians
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DOI：
10.1111/j.1747-0080.2012.01626.x
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发表时间：
2013-03-01
影响因子：
3.1
通讯作者：
Batterham, Marijka
中科院分区：
文献类型：
--
作者：
Tan, Li-Min;Charlton, Karen E.;Batterham, Marijka
目的：对健康有不利影响的缺碘症在澳大利亚重新出现。本研究旨在开发和验证一种新的碘特定的食物频率问卷，用于老年澳大利亚人。研究方法：一个49项的食物频率问卷，其中包括富碘食物，并在84名男性和女性年龄60 - 95岁的认知功能正常。通过食物频率问卷评估的膳食碘摄入量与三次重复的24小时膳食回忆进行了验证。选择尿点碘浓度作为碘摄入量生物标志物。使用BlandAltman图和组内系数确定两种饮食方法之间的一致性。膳食和尿碘之间的相关性进行了评估。9个月后，43名参与者重复了问卷调查，以确保重复性。结果：食物频率问卷和24小时饮食回忆测量的平均碘摄入量没有显着差异（P = 0.870）。两种方法中度相关（r = 0.377; P <0.05），BlandAltman图显示了可接受的一致性水平（P = 0.870）。尽管尿碘浓度与24小时饮食回忆之间存在相关性（r = 0.230; P <0.05），但食物频率问卷与尿碘浓度无关（r = 0.094; P = 0.40）。三联法的相关系数分别为0.238（尿碘）、0.953（食物频率问卷）、0.396（24小时膳食回忆），真实值未知。结论：一个简短的食物频率问卷，以评估习惯性膳食碘摄入量在老年澳大利亚人已被证明是有效的，在组水平上的分类个人根据他们的习惯性碘摄入量。食物频率问卷的可重复性仍有待证明。
Aim: Iodine deficiency, which has adverse effects on health has re-emerged in Australia. The present study aimed to develop and validate a novel iodine-specific food frequency questionnaire for use in older Australians. Methods: A 49-item food frequency questionnaire that included iodine-rich foods was constructed and administered in 84 men and women aged 6095years with normal cognitive function. Dietary iodine intake assessed by the food frequency questionnaire was validated against three repeated 24-hour dietary recalls. Urinary spot iodine concentrations were selected as iodine intake biomarker. Agreement between the two dietary methods was determined using a BlandAltman plot and intra-class coefficients. Correlations between dietary and urinary iodine were assessed. Forty-three participants repeated the questionnaire after 9months for reproducibility. Results: Mean iodine intake measured by the food frequency questionnaire and 24-hour dietary recalls did not differ significantly (P= 0.870). The two methods were moderately correlated (r = 0.377; P < 0.05) and the BlandAltman plots demonstrated an acceptable level of agreement (P= 0.870). Despite an association (r = 0.230; P < 0.05) between urinary iodine concentrations and 24-hour dietary recalls, the food frequency questionnaire was not associated with urinary iodine concentration (r = 0.094; P= 0.40). The method of triads showed coefficients of 0.238 (urinary iodine), 0.953(food frequency questionnaire), 0.396 (24-hour dietary recall) with the unknown true value. Conclusion: A short food frequency questionnaire to assess habitual dietary iodine intake in older Australians has been shown to be valid at the group level with regard to categorising individuals according to their habitual iodine intake. Reproducibility of the food frequency questionnaire remains to be demonstrated.