Advanced Research Institute for the Sciences and Humanities (ARISH), Nihon University, Tokyo, Japan.
Geriatr Gerontol Int. 2012 Apr;12(2):247-56. doi: 10.1111/j.1447-0594.2011.00759.x. Epub 2011 Oct 18.
The aims of this study are to investigate the accuracy of self-reported height, weight, and derived BMI of community-dwelling Japanese aged 70 and older, and to assess the concordance between report-based and measurement-based BMI categories.
We compared self-reported height and weight with physical measurements from data from a nationally representative sample (n = 1634).
Self-reported values were strongly correlated with measured values (Pearson's r: 0.92 and 0.89 for men and women, respectively, for height; 0.96 for both sexes for weight; 0.93 and 0.91 for men and women, respectively, for BMI). The differences in mean values were small. On average, height was overreported by 0.93 cm (SD = 2.48) for men and 1.23 cm (SD = 2.84) for women. Weight was underreported by 1.08 kg (SD = 2.55) for men and 0.88 kg (SD = 2.45) for women. BMI was underestimated by 0.68 kg/m(2) (SD = 1.16) for men and 0.79 kg/m(2) (SD = 1.49) for women. As age increases, height overreporting increased, particularly among women, but weight underreporting decreased for women. BMI underestimation increased for both sexes. Weighted kappa values showed a reasonably high concordance at 0.715 and 0.670 for men and women, respectively (P < 0.0001). Overweight (BMI 25.0 to 29.9) and obesity (BMI ≥ 30) prevalence rates were underestimated, with better specificity (range: 94.4-100%) than sensitivity (range: 59.3-65.1%).
The accuracy of self-reported height and weight is reasonably high among elderly Japanese, suggesting that the information can be used in epidemiological surveys. However, caution should be exercised for the oldest age group (age 85+), as the accuracy declined.
本研究旨在调查社区居住的 70 岁及以上日本老年人自我报告的身高、体重和衍生 BMI 的准确性，并评估基于报告和基于测量的 BMI 分类之间的一致性。
我们将自我报告的身高和体重与来自全国代表性样本的数据（n = 1634）的身体测量值进行比较。
自我报告的值与测量值高度相关（Pearson r：男性为 0.92，女性为 0.89，身高；两性均为 0.96，体重；男性分别为 0.93 和 0.91，女性为 0.91 和 0.91，BMI）。均值差异较小。平均而言，男性身高报告偏高 0.93 厘米（SD = 2.48），女性身高报告偏高 1.23 厘米（SD = 2.84）。男性体重报告偏低 1.08 公斤（SD = 2.55），女性体重报告偏低 0.88 公斤（SD = 2.45）。男性 BMI 低估 0.68 公斤/平方米（SD = 1.16），女性 BMI 低估 0.79 公斤/平方米（SD = 1.49）。随着年龄的增长，身高虚报增加，尤其是女性，但女性体重虚报减少。男女 BMI 低估均增加。体重加权 Kappa 值分别为 0.715 和 0.670，显示出相当高的一致性（P < 0.0001）。超重（BMI 25.0 至 29.9）和肥胖（BMI ≥ 30）的患病率被低估，特异性较好（范围：94.4-100%），敏感性较低（范围：59.3-65.1%）。
日本老年人自我报告的身高和体重准确性相当高，表明该信息可用于流行病学调查。然而，对于最年长的年龄组（85 岁以上），应谨慎使用，因为准确性下降。
