Research shows that: the power of cross-sectional group achieved by a quality improvement results can be achieved within the Department, group of the results obtained from 200% to 600%.

With the model, the cross sectional shape of a pressing is analyzed, and the public feasible zone of sectional angle is determined, and a group of target functions are created as optimization objects.

METHODS In a cross-sectional survey, we studied purified protein derivative(PPD) test in exposure group and control group.