① The method is simple, the result is intuitive and easy to use.

② It can describe the development level of children.

(3) can track and observe the development trend and speed of a child's index.

④ The development level of individual and group children can be compared.

The disadvantage is that only a single index can be evaluated, the development symmetry cannot be accurately judged, and the dynamic observation of its changing trend is not intuitive enough.

The basic content of growth and development evaluation includes three aspects: growth and development level, growth and development speed and the correlation of various indicators.

(1) Body mass index (BMI) = weight (kg)/[ height (m)]2. In recent years, scholars at home and abroad attach great importance to it, thinking that it can not only reflect the fullness and size of the body more sensitively. 18 years old, the index is ≥24 and ≥28, which can be screened as overweight and obesity respectively.

(2) Grade evaluation method (the most commonly used deviation method): used to evaluate the growth and development of individual and group children and adolescents. Disadvantages: only a single index can be evaluated, the development symmetry cannot be accurately judged, and the dynamic observation of its changing trend is not intuitive enough.