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目的运用人群调查资料对预包装食品营养价值评价模型的区分效度进行验证。方法选择2011年中国健康与营养调查数据作为评价资料,应用预包装食品营养价值评价模型计算18~60岁成年调查对象的个人膳食得分,然后按照调查对象个人膳食得分的五分位划分为五组;计算每一组调查对象各种营养素的摄入量,以及营养素平均需要量的不满足率与不同水平个人膳食得分之间的关联,以此来验证预包装食品营养价值评价模型的区分效度。结果调查对象能量、谷类蛋白摄入量和脂肪、饱和脂肪酸、钠等限制性营养素的摄入量随着个人膳食评分的升高而有下降的趋势(P<0.0001);其他来源的蛋白质、铁、维生素A、钙、维生素B1等营养素的摄入量则有相反的趋势(P<0.0001);调查对象不同营养素摄入量低于平均需要量(EAR)的比例均有随着个人膳食评分升高而下降的趋势(P<0.01)。结论预包装食品营养价值评价模型的区分效度得到验证,模型可反映调查对象膳食营养状况,提示预包装食品营养价值评价模型可以作为指导居民正确选择健康食品的工具。
Objective To verify the discriminant validity of the nutritional value evaluation model of pre-packaged foods by using population survey data. Methods The data of 2011 Chinese health and nutrition survey were selected as the evaluation data. The nutritional value of pre-packaged foods was used to calculate the personal dietary scores of 18 ~ 60-year-old adult surveyed subjects, then divided into five groups according to the quintile of individual dietary scores ; Calculate the intake of various nutrients in each group of respondents, as well as the relationship between the unsatisfied nutrient average requirement and the individual dietary scores at different levels, so as to verify the discriminative validity of the pre-packaged food nutritional value evaluation model . Results The intake of energy, cereal protein, and restrictive nutrients such as fat, saturated fatty acids and sodium decreased with the increase of individual dietary scores (P <0.0001). Other sources of protein, iron (P <0.0001). The proportion of subjects with different nutrient intakes below the average requirement (EAR) increased with the individual dietary scores High and declining trend (P <0.01). Conclusion The discriminant validity of pre-packaged food nutritional value evaluation model is validated. The model can reflect the dietary nutritional status of pre-packaged food, suggesting that pre-packaged food nutritional value evaluation model can be used as a tool to guide residents to correctly choose healthy food.