Clemente Linda, Moreira Pedro, Oliveira Bruno, Almeida Maria Daniel Vaz de
Faculdade de Ciências da Nutrição e Alimentação, Universidade do Porto, Porto.
Acta Med Port. 2004 Sep-Oct;17(5):353-8. Epub 2004 Dec 20.
Self-reported height and weight data have been used in several studies with the purpose of determining the prevalence of overweight and obesity. Despite being a simple methodology, little information exists about the reliability of these measures, namely, in university students. The objective of this study was to determine the sensitivity and specificity of self-reported body mass index (BMI) to evaluate the prevalence of overweight and obesity in university students.
In a convenience sample of 380 university students (226 women and 154 men), weight and height were obtained by self-reported measures and anthropometric assessment according to international standards methodology (objective). BMI was calculated from self-reported and direct measures.
The discrepancy between objective and self-reported weight was not significative. For height, this discrepancy was significantly different in women, in men, and between genders. The difference between BMI values was significantly different in women (0.8 +/- 1.1 kg/m2), in men (0.4 +/- 1.1 kg/m2) and between genders. Concerning overweight and obesity, according to the objective BMI, the sensitivity was only 50% in women, and 70% in men, while the specificity was 99% in women and 98% in men.
Our results show a poor sensitivity of self-reported weight and height data, to estimate overweight and obesity, thus, this method might not be reliable for studies of prevalence of obesity in this population.
在多项研究中使用了自我报告的身高和体重数据，目的是确定超重和肥胖的患病率。尽管这是一种简单的方法，但关于这些测量方法的可靠性，尤其是在大学生中的可靠性，所知甚少。本研究的目的是确定自我报告的体重指数（BMI）评估大学生超重和肥胖患病率的敏感性和特异性。
在一个由380名大学生（226名女性和154名男性）组成的便利样本中，通过自我报告测量以及根据国际标准方法进行人体测量评估（客观测量）来获取体重和身高。根据自我报告和直接测量计算BMI。
客观测量与自我报告的体重之间的差异不显著。对于身高，女性、男性以及不同性别之间的这种差异显著不同。女性（0.8±1.1kg/m²）、男性（0.4±1.1kg/m²）以及不同性别之间BMI值的差异显著不同。关于超重和肥胖，根据客观BMI，女性的敏感性仅为50%，男性为70%，而女性的特异性为99%，男性为98%。
我们的结果表明，自我报告的体重和身高数据在估计超重和肥胖方面敏感性较差，因此，这种方法可能不适用于该人群肥胖患病率的研究。
