Résumé
Objective@#To understand the prevalence of obesity and its associations with diet,exercise and mental health among students in Inner Mongolia, so as to provide scientific basis for the formulation of obesity intervention measures for students in this area.@*Methods@#Stratified and cluster random sampling was used to select 186 649 students from all 12 cities and 103 banners and counties in Inner Mongolia Autonomous region. All the participants were divided into groups according to the BMI classification criteria for overweight/obesity screening of Chinese school age children and adolescents (kg/m 2). Univariate analysis was carried out by means of rectangular χ 2 test, and multivariate unconditional Logistic regression model was used to screen the risk factors of obesity.@*Results@#The overall obesity rate was 18.54%, the obesity rate of boys was 22.04 %, and the obesity rate of girls was 14.99%. The results of multivariate Logistic regression analysis showed that area(OR=0.79), sex (OR=0.61), times of eating fried food per day (OR=1.08), daily exercise for more than 60 minutes per week >2 days (OR=0.89),eat breakfast every day (OR=0.86), times of drinking drinks per day (OR=1.12), Smoking (OR=0.87), drinking (OR=1.07), eating fruit per day (OR=1.07), watching TV ≥2 hours a day (OR=1.06), sleeping time (OR=0.93) and school period may be related to obesity (P<0.05).@*Conclusion@#The overall obesity rate of students in Inner Mongolia is relatively high, and the occurrence of obesity is related to diet, exercise behavior, living habits and psychological factors.
Résumé
Data were collected in different successional stages using a simultaneous sampling method and analyzed through quantitative classification method. Three large groups and 12 classes were made to represent the community patterns of three succession stages and 12 succession communities. The succession series of plant community in the study area was as follows: saline bare land-->community Suaeda salsa-->community Tamarix chinensis-->grassland. Succession degree and succession process of 12 succession communities were calculated. Most of these communities were in the lower succession stage, however, community Phragmites communis+Glycine soja and community Imperata cylindrica+G. soja were close to the succession stage of grassland climax. Five species diversity indices were used to study the changes in species richness, species evenness and diversity during succession of community. Heterogeneity index and richness index increased gradually during the community succession process, but species evenness tended to decrease with succession development. The relation between succession and environment was studied by ordination technique, and the results showed that the soil salt content was an important factor to halarch succession of the modern Yellow River Delta. It affected community structure, species composition and succession process.