Pan Shi-Qin, Zhang Qing, Su Cui-Hong, Wang Li
School of Nursing, Medical College, Soochow University, Suzhou, Jiangsu 215006, China.
First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, China.
Technol Health Care. 2018;26(3):537-542. doi: 10.3233/THC-171155.
Measuring body weight (BW) for bedridden patients often presents difficulty and challenge.
The present study aimed at providing a self-designed indirect method to predict BW by measuring weight underneath the buttock (WUB) of an individual in supine position, thereby providing an easy, safe and effective way of BW measurement for bedridden patients.
A total of 180 subjects participated in the present study and agreed to have their BW and WUB to be measured. BW was measured normally at the standing position through an electronic weighing machine without any special requirement. By placing the electronic weighing machine under the subject's buttock along with an additional hard board set under the electronic weighing machine, WUB was measured in subjects who were asked to assume a supine position in beds to simulate conditions of bedridden individuals. Measurement was repeated thrice to minimise the test error.
Average BW (62.7 ± 11.7 kg) was 2.0 ± 0.1 (≈ 2) folds of WUB (31.4 ± 6.0 kg). Significant linear correlation was identified between BW and WUB in all subjects with a linear equation yielded (y= 1.8 x + 6.0). Further multiple regression analysis resulted in an equation of BW (kg) =-36.8 + 1.66WUB (kg) + 29.0height (m). Predicted BW (PBW) was calculated out based on the results described above: the multiple relationship (2 folds), the linear equation, and the multiple regression equation, and differed from the measured BW by 3.6 ± 2.8, 3.5 ± 2.7 and 4.2 ± 3.1 kg respectively.
Predicting BW through WUB in supine position is effective and reliable because the latter can be easily measured and features a strong linear relationship with BW. This method provides clinical staff with remarkable benefits in BW determination for bedridden patients.
为卧床患者测量体重常常存在困难与挑战。
本研究旨在提供一种自行设计的间接方法，通过测量个体仰卧位时臀部下方的重量（WUB）来预测体重，从而为卧床患者提供一种简便、安全且有效的体重测量方法。
共有180名受试者参与本研究，并同意测量其体重和WUB。体重通过电子秤在站立位正常测量，无需特殊要求。将电子秤置于受试者臀部下方，并在电子秤下方放置一块额外的硬板，让受试者在床上仰卧以模拟卧床状态，测量WUB。测量重复三次以尽量减少测试误差。
平均体重（62.7±11.7千克）是WUB（31.4±6.0千克）的2.0±0.1（约为2）倍。所有受试者的体重与WUB之间存在显著的线性相关性，得出线性方程（y = 1.8x + 6.0）。进一步的多元回归分析得出体重（千克）=-36.8 + 1.66×WUB（千克）+ 29.0×身高（米）的方程。根据上述结果计算出预测体重（PBW）：多元关系（2倍）、线性方程和多元回归方程，预测体重与测量体重的差异分别为3.6±2.8、3.5±2.7和4.2±3.1千克。
通过仰卧位的WUB预测体重是有效且可靠的，因为WUB易于测量且与体重具有很强的线性关系。该方法在为卧床患者确定体重方面为临床工作人员带来了显著益处。
