Hingorjo Mozaffer Rahim, Syed Sadiqa, Qureshi Masood Anwar
Department of Physiology, Fatima Jinnah Dental College, Karachi, Pakistan.
J Pak Med Assoc. 2009 Aug;59(8):528-32.
To compare body mass index (BMI), waist circumference (WC), and body fat percentage (%BF), as index of overweight and obesity in young adults. We also intended to find an association between lifestyle behaviours and obesity.
A cross-sectional study was conducted at Fatima Jinnah Dental College, Karachi, during 2007 to 2008, with 192 first year dental students, (18-21years) of high socioeconomic class. All were questioned regarding lifestyle behaviours. Overweight and obesity were estimated by measuring %BF, BMI, and WC. For %BF, skinfold thickness was measured using skinfold calipers. BMI > or = 23.0-24.9 kg/m2 was taken as overweight and > or = 25.0 kg/m2 as obese (Asians criteria proposed by Western Pacific Regional Office of World Health Organization). WC using Asian cutoff values for overweight and obesity were: males > or = 78 cm and > or = 90 cm; females > or = 72 cm and > or = 80 cm, respectively. Body fat percentage used to define overweight and obesity was: males 22.1-27.0 and > 27.1; females 27.1-32.0 and > 32.1, respectively. Pearson's correlation was done between the BMI, WC and %BF with statistical significance taken at P < 0.01.
BMI (Expressed as mean +/- SD) in males and females was 23.82 +/- 3.88 and 20.98 +/- 4.12 respectively. WC was 83.63 +/- 10.20 cm in males and 70.22 +/- 9.36 cm in females. %BF was 22.32 +/- 6.27 in males and 28.73 +/- 6.65 in females, with an overall 60.8% females and 44.4% males found to be overweight or obese. Obesity was underpredicted by BMI when compared to skinfold calipers method. The obese were seen to skip breakfast more often [odds ratio (OR): 2.39], take frequent snacks (OR: 1.58), watch television more (OR: 1.58), and were physically less active than their non-obese counterparts.
Body fat percentage using skinfold caliper is a reliable index of obesity. Lack of sleep and skipping of breakfast, are prominent promoters of obesity, in addition to other lifestyle behaviours.
比较体重指数（BMI）、腰围（WC）和体脂百分比（%BF）作为年轻成年人超重和肥胖指标的情况。我们还旨在找出生活方式行为与肥胖之间的关联。
2007年至2008年期间，在卡拉奇的法蒂玛·真纳牙科学院对192名高社会经济阶层的一年级牙科学生（18 - 21岁）进行了一项横断面研究。所有学生都被问及生活方式行为。通过测量%BF、BMI和WC来评估超重和肥胖情况。对于%BF，使用皮褶厚度计测量皮褶厚度。BMI≥23.0 - 24.9kg/m²被视为超重≥25.0kg/m²被视为肥胖（世界卫生组织西太平洋区域办事处提出的亚洲人标准）。使用亚洲超重和肥胖临界值时，WC标准为：男性≥78cm和≥90cm；女性≥72cm和≥80cm。用于定义超重和肥胖的体脂百分比标准为：男性22.1 - 2-7.0和＞27.1；女性27.1 - 32.0和＞32.1。对BMI、WC和%BF进行Pearson相关性分析，P＜0.01时具有统计学意义。
男性和女性的BMI（以均值±标准差表示）分别为23.82±3.88和20.98±4.12。男性的WC为83.63±10.20cm，女性为70.22±9.36cm。男性的%BF为22.32±6.2-7，女性为28.73±6.65，总体上60.8%的女性和44.4%的男性被发现超重或肥胖。与皮褶厚度计法相比，BMI对肥胖的预测不足。肥胖者比非肥胖者更常不吃早餐[优势比（OR）：2.39]、经常吃零食（OR：1.58）、看电视更多（OR：1.58）且身体活动较少。
使用皮褶厚度计测量的体脂百分比是肥胖的可靠指标。除其他生活方式行为外，睡眠不足和不吃早餐是肥胖的重要促成因素。
