| OBJECTIVE: To understand causal and relative factors of simple childhood obesity (SCO) in Tianjin and to scientifically provide data for prevention and control childhood obesity, a matched case-control study was conducted with data of epidemiological sampling survey of 9908 children since September to march 1999 in Tianjin. MATERIAS AND METHODS: The cases were selected from 501 childhood obesity from 6 to 16 years old of 9908 children in the survey. The controls were selected from other children of 548 normal weight matched by age, sex and school. The cases and the controls matched by 1:1 and 1:2. WHO's definition as the body mass index (BMI) and national name of obesity was referenced and used in this study for diagnostic criterion of childhood obesity. The analysis method in term of descriptive study and case comparison were used in this research. T-test and chi-square test is used in descriptive research and comparison of difference. To carry through analysis of the conditional Logistic regression model in comparison analysis of single variable and multivariate, Cox regression model was used in analysis of case-control study matched by 1 :N. The relative factors to SCO were systemic investigated and completely analyzed by single factor and adjusted by confounding factors.RESULS: Risk factors were modestly positively associated with low educational level of father and low score of child study in school. The data showed that where were lack statistic relrtionships between singlechild, character, income of family, educational level of mother ,age and occupation of parent and childhood obesity.Childhood obesity related to degree of preference for motion, density of activity, everyday exercise time and housework time for children. The less enjoy physical activity, the longer everyday look TV time, the bigger risk of developing obesity. The stronger density of activity, the longer everyday exercise time or everyday activity time(exercise time + time of housework), the smaller risk of developing obesity. The results did not showed the correlation of children obesity with homework time, time of sleep, quality of sleep, distance to school and vehicle to take to school.SCO was significant relativity to weight when they were going to school and born. The more weight of body when is born and going to school, the more risk of body suffer from obesity. SCO was related to measure of feeding, bottle feeding to breast feeding odds ratio: OR= 1.73(1.20,2.71). The fast of speed to eat, the high of risk to suffer from obesity. There are no evidence to show that obesity significant relate to some eating habits such as times of meal, breakfast to eat or not; the latest time in evenings when they eat, eating regulation and eating sock to affect quality of absorb per day, sweetmeat, eating quality of glucose.Obesity related significantly to quality of eating. The more main food, meat, cooking oil to take per day, the more risk suffer from overweight. Overweight is high relative to red meat rather than white meat. After relative factor were adjusted, taking quality of main food, meat and cooking oil per day are significant associated with obesity. There was not evidence to show that taking quality of milk, vegetable and water had significant relation to obesity.The study showed that risk of developing obesity increased with taking quality of carbohydrate, protein and fat intake. The more intake of fatty acid (include saturated fatty acids, unsaturated fatty acids and polyunsaturated fatty acids), the more risk suffers from obesity.The more of intake of fat, protein and carbohydrate, the more risk of suffer from obesity. Above intake of three main nutrients were changed to intake of caloric to show risk of obesity increasing with intake of caloric. Putting intake of three nutrients per day into Logistic model indicated risk of obesity increasing with intake. The effect of three nutrients were each other biindependent. After adjusted by relative factor, intake of vitamin C can protect to suffer from obesity, eating fiber, cholesterol and vitami...
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