不同空间插值方法在钠摄入量估算中的应用

目的 采用空间插值法对缺失膳食钠摄入量数据的地区进行摄入量估算.方法 膳食钠消费数据来自2010-2012年中国居民营养与健康状况监测,调查采用多阶段分层与人口成比例的整群随机抽样方法,共调查了150个区县20岁及以上居民的膳食消费数据.运用连续3天24小时膳食回顾法结合家庭调味品称重法,进行面对面访谈共收集了48 8...

Application of different spatial interpolation methods in sodium intake estimation

OBJECTIVE The spatial interpolation method was used to estimate the intake of sodium in the areas without dietary sodium intake data. METHODS The data of dietary sodium consumption in this study are from the 2010-2012 China National Nutrition and Health Surveillance(CNNHS),the CNNHS was carried out on stratified multistage systematic clustered random sampling method with proportional to the population to form a representative sample of China as a whole, including 150 survey site. Dietary data was collected through face-to-face interview, based on a combination of three consecutive days of 24-h recalls combined with a household food weighting method, a total of 48 826 participants aged 20 years old and more were recruited in this study. The average sodium intake among 150 survey sites were calculated according to data of the CNNHS 2010-2012. The accuracy of spatial analysis techniques, such as Inverse Distance Weight, Ordinary Kriging, Cooperative Kriging method and Regression Kriging Interpolation method, was compared in the estimation of dietary sodium intake. The spatial analysis method with the highest accuracy was used to estimate the daily dietary sodium intake of each district and county in China, and then the dietary sodium intake of each province was calculated according to the population weight. RESULTS The average sodium intake among Chinese adults was 5.18 g, among which the average intake of men is 5.33 g and that of women was 5.03 g. Comparing the accuracy of four spatial analysis method in estimating dietary sodium intake, it was found that the Regression Kriging Interpolation method was superior to the other three methods, with root mean square error and mean absolute error of 0.54 and 0.44. The Regression Kriging Interpolation method was used to estimate the dietary sodium intake in different regions of China, the estimated national dietary sodium intake by population weighted calculation was 5.17 g/d, the estimated national dietary sodium intake was 5.33 g/d for men and 5.01 g/d for women. The difference rate between the measured and estimated dietary sodium intake for all age groups was not more than 10%. Shandong Province, Tianjin City and Hebei Province had the highest sodium intake, which was 5.98 g/d, 5.83 g/d and 5.82 g/d, respectively. Guizhou Province had the lowest sodium intake, with an estimated intake value of 4.27 g/d. CONCLUSION The spatial interpolation method can be used to estimate the intake of sodium, and the accuracy of Regression Kriging Interpolation method is higher than other spatial interpolation method.