Bishop C W, Pitchey S J
J Am Diet Assoc. 1987 Apr;87(4):469-73.
The mid-upper arm circumference measurement error was estimated in order to assess the usefulness of this measurement for detecting small changes in a patient's arm circumference during hospitalization. In a study having a 3 X 3 X 2 factorial design, 10 trained observers recorded 1,560 measurements from 52 healthy adult subjects selected to represent three factors: sex, age, and weight for height. Each observer obtained three independent measurements from every subject. By analysis of variance, the variation between different observers' measurements of the same subject was estimated with 95% confidence to be less than or equal to 2.8% for men and less than or equal to 3.8% for women. This variation was unaffected by age but decreased with decreasing weight for height in women (p less than .05). Variation between each observer's repeated measurements of the same subject was estimated with 95% confidence to be less than or equal to 1.1% and was unaffected by sex, age, or weight for height. It was concluded that the smallest detectable change in arm circumference is 7.8% for men and 9.8% for women when successive measurements are recorded by different observers. However, arm circumference changes as small as 2.2% can be detected in both men and women when successive measurements are obtained by the same observer.
为了评估上臂中部周长测量在检测患者住院期间手臂周长微小变化方面的实用性，对该测量的误差进行了估计。在一项采用3×3×2析因设计的研究中，10名经过培训的观察者对52名健康成年受试者进行了1560次测量，这些受试者被选来代表三个因素：性别、年龄和身高体重比。每个观察者从每个受试者那里获得三次独立测量值。通过方差分析，同一受试者不同观察者测量值之间的差异在95%置信度下估计为男性小于或等于2.8%，女性小于或等于3.8%。这种差异不受年龄影响，但在女性中随身高体重比的降低而减小（p小于0.05）。同一受试者每次观察者重复测量值之间的差异在95%置信度下估计为小于或等于1.1%，且不受性别、年龄或身高体重比影响。得出的结论是，当由不同观察者记录连续测量值时，男性手臂周长的最小可检测变化为7.8%，女性为9.8%。然而，当由同一观察者进行连续测量时，男性和女性手臂周长小至2.2%的变化都可以被检测到。
