Suzuki Ayako, Miyauchi Megumi, Hattori Iku, Egami Isuzu, Wakai Kenji, Tamakoshi Akiko, Ando Masahiko, Nakayama Toshiko, Ohno Yoshiyuki, Kawamura Takashi
Department of Preventive Medicine/Biostatistics and Medical Decision Making, Nagoya University Graduate School of Medicine.
Nihon Koshu Eisei Zasshi. 2002 Aug;49(8):749-58.
Estimation of nutritional intake from photographs of served meals has been proposed. We examined the inter-observer agreement and validity of this method for assessment of the daily diet.
Twenty-five family members (13 men and 12 women, mean age +/- SD: 47.3 +/- 5.6 years) of students in a dietetic course performed both meal photography and traditional weighed dietary records for four days. For the photo method, two observers independently identified foods and estimated their portion sizes from the photographs, converting them into energy and nutrient intake with a food composition table. The inter-observer agreement with the photo method was assessed in terms of inter-observer ratios, correlations, and coefficients of variation (CV), and the method was validated using the weighed dietary records as the reference. Its running cost was also calculated.
The inter-observer ratios for estimation of mean daily nutritional intake ranged from 0.89 (magnesium) to 1.14 (retinol) with a median of 1.03. The correlation coefficients between observers varied from 0.65 (saturated fatty acids [SFA]) to 0.92 (vitamin C) on a daily basis (median, 0.79), and from 0.65 (SFA) to 0.96 (vitamin C) on an individual basis (median, 0.78). The CVs ranged from 7.9% (energy) to 23.8% (carotenc) (median, 13.3%), and from 5.2% (energy and magnesium) to 17.8% (carotene) (median, 8.8%) for daily and individual intake, respectively. Regarding validity, the ratios between methods (the photo method/weighed dietary records) ranged from 0.96 (potassium and SFA) to 1.11 (retinal and salt) with a median of 1.00. Correlations between the two methods were distributed from 0.40 (salt) to 0.82 (vitamin C and retinol) on a daily basis (median, 0.67), and from 0.47 (salt) to 0.90 (vitamin C) on an individual basis (median, 0.74). The CVs ranged from 10.5% (energy) to 39.6% (carotene) (median, 16.9%), and from 6.1% (protein) to 20.6% (carotene) (median, 11.2%), respectively. It was calculated to cost 105 Japanese yen per meal when using a lens-attached film for 25 shots.
Inter-observer agreement and validity of the photo method, though varying with the nutrient, were generally acceptable. Although some modifications are needed for diners-out, the method appears to be useful as a dietary recording tool.
有人提出通过拍摄所提供餐食的照片来估算营养摄入量。我们检验了这种评估日常饮食方法的观察者间一致性和有效性。
25名饮食课程学生的家庭成员（13名男性和12名女性，平均年龄±标准差：47.3±5.6岁）进行了为期四天的餐食拍照和传统的称重饮食记录。对于照片法，两名观察者独立识别食物并从照片中估算其份量大小，使用食物成分表将其转换为能量和营养摄入量。根据观察者间比率、相关性和变异系数（CV）评估照片法的观察者间一致性，并以称重饮食记录作为参考对该方法进行验证。还计算了其运行成本。
估算每日平均营养摄入量的观察者间比率范围为0.89（镁）至1.14（视黄醇），中位数为1.03。观察者之间的相关系数每日从0.65（饱和脂肪酸[SFA]）至0.92（维生素C）（中位数，0.79），个体间从0.65（SFA）至0.96（维生素C）（中位数，0.78）。每日摄入量的CV范围为7.9%（能量）至23.8%（胡萝卜素）（中位数，13.3%），个体摄入量的CV范围分别为5.2%（能量和镁）至17.8%（胡萝卜素）（中位数，8.8%）。关于有效性，两种方法（照片法/称重饮食记录）之间的比率范围为0.96（钾和SFA）至1.11（视黄醛和盐），中位数为1.00。两种方法之间的相关性每日从0.40（盐）至0.82（维生素C和视黄醇）（中位数，0.67），个体间从0.47（盐）至0.90（维生素C）（中位数，0.74）。CV范围分别为10.5%（能量）至39.6%（胡萝卜素）（中位数，16.9%），以及6.1%（蛋白质）至20.6%（胡萝卜素）（中位数，11.2%）。使用可拍摄25张照片的带镜头胶卷时，计算得出每餐成本为105日元。
照片法的观察者间一致性和有效性虽因营养素而异，但总体上是可接受的。尽管外出就餐时需要一些改进，但该方法似乎可作为一种饮食记录工具。
