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目的研究1991～2009年湖北省20～45岁成年人体质指数分布模式和变化趋势。方法采用分层多阶段整群随机抽样的方法,于1991～2009年在湖北省(2个城市点和4个农村点)进行健康与营养调查,选取20～45岁成年居民作为研究对象(1991年676名,2000年506名,2009年321名),分别从年份、性别和地区角度分析20～45岁居民低体重、正常、超重构成比及率的变化。1991年和2009年的BMI百分曲线采用年龄性别法。结果同1991年相比,2009年男女的体质指数曲线均上移。超重率男性增加了13.9%,女性增加了12.0%。超重/肥胖率的增长速度远超过了男女性低体重率的下降速度。专用的体质指数年龄性别百分位曲线表明,对于男性来说,1991～2009年体质指数第15、第50和第85百分位曲线总体呈增加趋势,在体质指数百分位较高水平上升率也较大。年龄对男性体质指数曲线变动影响较大。当男性年龄超过32岁,在同一百分位曲线,例如,在第15或第50百分曲线,该曲线增长值大于对应的年轻男子。女性体重指数第15、第50和第85个百分曲线在(1991～2009年)18年期间总体呈现稳定趋势。结论中国居民的体质指数变化显示20～45岁男性变动大于女性,对于每一相应年龄-体质指数百分曲线,女性的变化小于男性。
Objective To study the distribution pattern and changing trend of body mass index of adults aged 20 ~ 45 in Hubei Province from 1991 to 2009. Methods A stratified multistage cluster random sampling method was used to investigate the health and nutrition in Hubei Province (2 cities and 4 rural areas) from 1991 to 2009, and adult residents between 20 and 45 years old were selected as the research object (1991 Year, 676, 506 in 2000, and 321 in 2009). The changes of low weight, normal, overweight ratio and rate among residents aged 20-45 years were analyzed respectively from year, gender and region. The BMI percentage curves for 1991 and 2009 use age-specific gender. Results Compared with 1991, the body mass index curve of both men and women moved up in 2009. Overweight men increased by 13.9%, women increased by 12.0%. The rate of overweight / obesity far exceeds that of men and women at low rates of weight loss. For the men, the 15th, 50th and 85th percentile curves of body mass index showed a general trend of increase from 1991 to 2009, and at the higher level of the body mass index percentile The rate of increase is also larger. Age has a greater impact on the change of body mass index in men. When men over 32 years of age, in the same percentile curve, for example, at the 15th or 50th percentile curve, the curve increased in value greater than the corresponding young man. The 15th, 50th and 85th percentiles of female body mass index showed a general trend of stabilization during the 18 years (1991-2009). Conclusion The change of body mass index of Chinese residents shows that the changes of males in 20-45 years old are greater than that of females. For each corresponding age-body mass index percentage curve, the change of females is smaller than that of males.