基于随机森林分析广西地区20~39岁青年人超重及肥胖的影响因素

Influential factors of overweight and obesity in young adults aged 20 to 39 in Guangxi based on random forest algorithm

目的探讨广西地区20~39岁青年人的交通方式、工作状态、闲暇时间的活动对超重和肥胖的影响,为提高全民身体素质水平提供参考意见。方法对广西14个地市的国民体质监测中心监测点的20~39岁青年人进行随机整群抽样,共纳入7534例研究对象。将其分成20~<30岁、30~39岁两组资料过采样处理后建立随机森林分类模型。结果根据基尼指数的下降幅度对变量重要性排序结果显示:20~<30岁青年超重和肥胖的影响因素主要为骑摩托车、电动车时长,读书、用电脑等时长,看电视、听广播时长,以静坐伏案为主时长,轻家务劳动时长;30~39岁青年超重和肥胖的影响因素主要为骑摩托车或电动车时长,看电视、听广播时长,读书、用电脑等时长,轻家务劳动时长,以静坐伏案为主时长。结论人们要尽量缩短静坐行为的持续时间。短距离路程尽量选择骑自行车和步行,工作方式与闲暇活动方面避免久坐,增加科学规律的体育锻炼。

Objective To explore the influence of transportation mode,working status,and leisure time activity on overweight and obesity among young adults aged 20 to 39 in Guangxi,so as to provide a reference for improving the physical fitness level of the whole population.Methods A randomized wholegroup sample of young adults aged 20-39 years from institutions in cities of Guangxi was conducted,with a total of 7534 cases.The data were divided into 20-<30 and 30-39 ages groups,and a random forest classification model were constructed after over-sampling a random forest classification model.Results According to the decline of the Gini index,we ranked the importance of the variables.The main influencing factors of overweight and obesity for young people aged 20-<30 were the time spent riding motorcycles,electric bicycles,reading and using computers,the time spent watching TV and listening to the radio,mainly sitting at a desk,and light housework.As for 30-39 age group,the influencing factors of overweight and obesity were,in order,the length of time riding a motorcycle or electric vehicle;the length of watching TV and listening to the radio;the length of reading and using the computer;the length of light housework;the length of sitting mainly at the desk.Conclusions People should try to shorten the duration of sedentary behavior.In a short distance,try to choose cycling and walking,avoid sedentary work style and leisure activities,and increase scientific and regular physical exercise will be good choices.