GB 16397-2011Effect judging for preventive measures of Kaschin-Beck disease (English PDF)

4.1 Markedly

In accordance with the requirements of Appendix A, and after implementing preventive measures to ward three years, it should also have the following two can be judged to have a significant effect (Jane He said markedly).

a) observation of the original population without clinical I of new cases and over;

b) the observation of the population without KBD X-ray-positive cases.

4.2 Effective

In accordance with the requirements of Appendix A, and after implementing preventive measures to ward three years, it should also have the following two can be determined to be valid.

a) the original observation group I clinical incidence of <=2%, and no more cases occurred and II degree;

b) the observed X-ray positive rate of population <=10% and the positive rate of bone ends <=3%, and no early epiphyseal closure and triad cases.

4.3 Invalid

In accordance with the requirements of Appendix A, and after implementing preventive measures to ward three years, with the following one, could be judged as invalid.

a) the original population was observed in clinical I degree or higher incidence > 2%;

b) the crowd observed X-ray positive rate of > 10%, or bone-side positive rate > 3%.

Appendix A

(Normative)

Kashin-Beck Disease Prevention in judgment conditions require A.1 observation ward selection Determined in accordance with GB 16395 wards, select the active disease severity index > Ward 50 of a village or several. Such as the condition level of activity no index > 50 Ward village, you can choose the degree of active disease in the index between 12 to 50 wards village one or more disease refers to the level of activity Calculation formula, see formula (A.1).

Active disease severity index = Metaphyseal lesion detection Listings Number of subjects Metaphyseal lesions, "", "" total detection number æ Metaphyseal lesions detected total number × 100 (A.1) A.2 crowd observe conditions and counting Continuous residence in the ward for six months or more, and the local drinking water and eating local food for children age 7 to 9 years of age, the number of not less than 100 people observed the end dropout rate does not exceed 10%.

A.3 observe the health status of populations Observe the initial stage, X-ray examination no right anteroposterior KBD change.

A.4 observation period from March to April each year to conduct a clinical observation and X-ray film, observed for 3 consecutive years.

A.5 X-ray film site

Hand radiographs (including wrist).

A.6 X line case diagnosis Specific diagnostic methods, see WS/T 207.

A.7 establish reasonable control in the same ward, select the sex, age, the number of people observe the same as the control group.