1. Overall level: This level is the overall description of the health status of rivers and lakes and the core of the whole evaluation index system. It usually includes one or more overall indicators, such as "overall water quality", "biodiversity index" and "hydrological status". These indicators can reflect the overall health level of rivers and lakes and are an important basis for formulating river and lake management strategies.
2. Category layer: This layer is the decomposition of the whole layer, reflecting all aspects of the health of rivers and lakes. For example, the overall situation of water quality can be subdivided into chemical oxygen demand, total phosphorus concentration, suspended solids concentration and other indicators. Biodiversity index can be subdivided into "species diversity" and "ecosystem diversity".
3. Indicator level: This level is the lowest level of the evaluation indicator system, including specific monitoring indicators and evaluation criteria. These indicators are usually operable and measurable, such as pH value, water level and ammonia nitrogen concentration. The index layer provides a basis for the actual assessment of the health status of rivers and lakes.
The significance of health assessment is mainly reflected in the following aspects:
1. Disease prevention: Through the assessment of physical condition, potential health problems can be found in time, and measures can be taken to intervene in advance to prevent the occurrence of diseases. Improve the quality of life: Through health assessment, you can know your living habits and physical condition, and take targeted measures to improve the quality of life and enhance your physique.
2. Guiding treatment: For people who are already sick, health assessment can help doctors understand the patient's condition, provide basis for making treatment plans, and guide the treatment direction. Monitoring rehabilitation: In the process of rehabilitation, regular health assessment can monitor the recovery of the body, adjust the rehabilitation plan in time and promote the recovery of the body as soon as possible.
3. Health effect evaluation: Through health evaluation, we can evaluate the health effect of individuals or groups, and provide reference for the formulation and implementation of public health policies.
4. Promote health awareness: By participating in health assessment, people can pay more attention to their health, improve their health awareness and consciously adopt a healthy lifestyle. Guide health investment: According to the results of health assessment, more resources can be invested to improve health and quality of life.