The existing situation research is to study the relationship between related variables (factors) and diseases or health status in a specific time or period, that is, to investigate whether individuals in this specific group are sick or not, whether they have certain variables or characteristics, so as to explore the disease situation of exposed and unexposed groups with different characteristics or whether the sick group is exposed.

Extended data:

Matters needing attention in writing papers;

The length of the research status quo is generally around 1000 words. And attach an authoritative and timely bibliography. When writing about the research status quo, we should not simply list it, but avoid triviality and irrelevance.

In addition, we should avoid empty and general remarks. We should start from the big picture first, then gradually converge, and finally focus on the research problem of this topic. It is necessary to summarize and integrate the collected research literature, objectively explain the research background, and then make subjective comments on the shortcomings of the existing research.

It is necessary to point out the viewpoints, solutions and achievements of domestic and foreign literatures on related topics, and expound the breadth, depth and shortcomings of these studies, so as to put forward problems to be further studied, determine the research platform of this topic, and point out what breakthroughs this topic expects.