Chimeddamba Oyun, Gearon Emma, Brilleman Samuel L, Tumenjargal Enkhjargal, Peeters Anna
Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Level 6, 99 Commercial Road, Melbourne, VIC 3004 Australia.
Deakin University, Geelong, Victoria, School of Health and Social Development, Faculty of Health, Melbourne, Australia.
BMC Obes. 2017 May 8;4:19. doi: 10.1186/s40608-017-0155-3. eCollection 2017.
In Mongolia, mean waist circumference (WC) has increased dramatically over the last decade, however, it is unknown whether these increases have been greater than corresponding increases in weight. In this study we aimed to assess whether recent increases in WC were greater than expected from changes in weight in Mongolian adults.
We used data on 13260 Mongolian adults, aged between 18 and 64 years, who participated in one of three (2005, 2009, 2013) nationally representative cross-sectional surveys. Linear regression was used to estimate changes in mean WC over time, adjusted for age, sex, height and weight. We also estimated the age-standardised prevalence for four obesity classification categories (not obese; obese by WC only; obese by body mass index (BMI) only; obese by both BMI and WC) at each survey year.
The estimated mean WC in 2009 and 2013, respectively, was 1.26 cm (95% CI: 0.35 to 2.17) and 1.88 cm (95% CI: 1.09 to 2.67) greater compared to 2005, after adjusting for age, sex, height and weight. Between 2005 and 2013, the age-standardised prevalence of those obese according to both BMI and WC increased from 8.0 to 13.6% for men and from 16.5 to 25.5% for women. During the same period, the percentage who were obese by WC only increased from 1.8 to 4.8% for men and from 16.5 to 26.8% for women. In contrast, the percentage who were obese by BMI only remained relatively stable (women: 2.4% in 2005 to 1.0% in 2013; men: 2.7% in 2005 to 4.0% in 2013).
Over the last decade, among Mongolian adults, there has been substantially greater increase in WC and the prevalence of abdominal obesity than would be expected from increases in weight. Women are at greater risk than men of being misclassified as not obese if obesity is defined using BMI only. Obesity should be monitored using WC in addition to BMI to ensure the prevalence of obesity is not underestimated.
在蒙古，过去十年间平均腰围（WC）急剧增加，然而，这些增加幅度是否大于体重相应的增加幅度尚不清楚。在本研究中，我们旨在评估蒙古成年人近期腰围的增加幅度是否大于体重变化所预期的幅度。
我们使用了13260名年龄在18至64岁之间的蒙古成年人的数据，这些人参与了三项（2005年、2009年、2013年）具有全国代表性的横断面调查之一。采用线性回归来估计平均腰围随时间的变化，并对年龄、性别、身高和体重进行了调整。我们还估计了每个调查年份四种肥胖分类类别（不肥胖；仅腰围肥胖；仅体重指数（BMI）肥胖；BMI和腰围均肥胖）的年龄标准化患病率。
在调整年龄、性别、身高和体重后，2009年和2013年的估计平均腰围分别比2005年增加了1.26厘米（95%置信区间：0.35至2.17）和1.88厘米（95%置信区间：1.09至2.67）。2005年至2013年期间，根据BMI和腰围均肥胖的男性年龄标准化患病率从8.0%增至13.6%，女性从16.5%增至25.5%。同期，仅腰围肥胖的男性比例从1.8%增至4.8%，女性从16.5%增至26.8%。相比之下，仅BMI肥胖的比例相对稳定（女性：2005年为2.4%，2013年为1.0%；男性：2005年为2.7%，2013年为4.0%）。
在过去十年中，蒙古成年人的腰围和腹部肥胖患病率的增加幅度远远大于体重增加所预期的幅度。如果仅使用BMI定义肥胖，女性被误分类为不肥胖的风险高于男性。除了BMI之外，还应使用腰围来监测肥胖情况，以确保不低估肥胖患病率。
