Sanitary statistics - the branch of medicine that studies the statistical methods of the population health status, health care and the impact of the social and other factors. Statistical methods are also used in scientific medical research.

Sanitary statistics statistics is divided into the health of the population and health statistics. Sanitary statistics is of great importance for health practice: a statistical materials about health and health services to the population to help the preparation of scientific forecast of the health status of the population, which is the basis for planning and carrying out public health measures, improvement and further development of the case of health.

Statistics health includes sanitary and demographic statistics, statistics of morbidity and statistics of physical development. Sanitary and demographic statistics examines the size and age-sex composition of the population, fertility, mortality, population growth , life expectancy , etc.

Statistics of morbidity determines how often and what hurts the population as a whole and in its territorial, age and sex, professional and other groups.

Statistics of physical development contains data on height, weight, circumference of breast and other characteristics of the surveyed in different population groups.

Health statistics gives a description of the network of medical institutions, their staff and activities. It includes information on the number of establishments: types / (hospitals, polyclinics, sanitary station , and so on), capacity (number of beds, rooms, equipment, etc); identifies the level of provision of the population with doctors, average medical personnel, hospital beds and other, and also covers the scope and effectiveness of the work done.

Along with the quantitative indicators of activity of institutions of health statistics gives a description of the qualitative indicators of the quality of diagnosis and treatment. The statistics are also used in scientific research: it helps to determine the effectiveness of any new ways of diagnostics, treatment, prevention; right to collect, summarize and analyze the data in various experiments. Each statistical work consists mainly of three stages: 1) statistical observation, 2) grouping and summary of the collected materials, 3) conversion summary and analysis. In practical work of medical institutions these three stages are respectively: 1) accounting, 2) report, 3) an explanatory note or the economic Outlook.

For the successful realization of the first stage it is necessary to ensure the completeness, correctness and timeliness of data collection. Weight is in the coverage of registration of all the planned programme of observation units and carried signs

them (for example, the name of a disease, sex and age of the patient, and so on). The correctness of the data is determined by the compliance of their reality, and a clear understanding of the defined terms. For example, the case of illness of temporary disability is considered a disease, which ended with the statement of work or other outcomes; the continuation of sick leave is not considered complete case.

The task of the second stage - report - is to distribute the initial documents for groups with specific characteristics and the subsequent counting of observation units in these groups. Grouping items shall be determined by the purpose of the study, to be built on the basis of qualitative homogeneity of observation units within groups, to ensure a comprehensive coverage of the investigated issue. For example, if we are talking about the group of materials in the study of morbidity with temporary disability, sick leave are grouped into departments (production), within groups - by the nature of the disease, sex, age, etc.

It is estimated by groups number of observation units are then in statistical tables. Tables are on the construction of three kinds: 1) simple, in which the investigated objects are considered only one any grounds, such as patients by age; 2) group, in which study contingents, distributed into groups that are characterized by several different signs without their combinations (see table); 3) Raman, in which the phenomenon under investigation is considered in combination of various features. For example, a group of cheering workers distribute the forms of the disease inside these forms - on the floor, inside the sex - age etc.

The second stage of the statistical research is completed preparation obtained summary of the analysis by calculation of statistical indicators, which are divided into absolute and relative. To relative numbers belong to the following. 1. Relative number of distribution (or extensive). They are used to define the share ("share") of one or another part within the whole of the researched population, such as the percentage ill with influenza in the total number of patients. These relative values are calculated by the formula:

the number of units in this part X100 / total units for the whole population

2. Relative number frequency (or intensive). They measure the frequency of something in the environment, such as the number ill with influenza per 100 workers (employees and others). The calculation in General is calculated by the formula:

the number of units in the investigated phenomena X100 (1000, 10000 and so on) / number of units in a given environment.

The former include also the average number (which may be absolute or relative), for example, the average length of patients ' stay in hospital, etc., the Average should be calculated in relation to qualitatively similar phenomena. For example, the average time of treatment have value if they are computed with respect to a specific disease.

The third stage of the statistical survey - analysis of the indicators is the interpretation of the obtained data, identifying behind their reasons, in comparison with the size of their planned regulations, with the previous periods, with indicators achieved advanced medical institutions, etc.

In ensuring good performances statistical work in the medical institution, Department, office, laboratory greater role for the nurse. In statistical research assistant, medical assistant, nurse are closest aides doctor; they have to make a copy of the necessary data from medical documents (medical records, sick leave and other). The average health worker should have a good knowledge of medical terminology. In those cases, when it is entrusted to a survey of the subject, he shall clearly record the received answers. For further grouping of collected materials nurses performs a responsible role in their encoding, i.e., the making of the legend of those or other characteristics: digital (for example, to specify the number of diseases established by the international classification and nomenclature of diseases), the letter (for example, to indicate the age of 19 years - the letter a, from 20 to 29 - B, and so on). Then he counts the data and submits them in the statistical tables. Calculation of the data and the calculation of indicators produced by computing equipment. Large statistical materials are processed on mashinoschyotnaya stations. Average health worker involved in this work, we have to perform charts and other graphics.

Cm. also the medical Documentation, Reporting health.

**The distribution of injuries according to the localization and severity (conditional)**