Objective To initially verify diagnostic efficiency of diagnostic criterion of bronchial asthma syndrome established in this project. Methods Foresight research methods was adopted to collect information of 300 cases of bronchial asthma from four grade Ⅲ

class A hospitals and to establish a database. "Questionnaire of Chinese Medicine Syndrome of Bronchial Asthma Diagnosis"was used to investigate distribution of 10 syndromes in patients

including cold in the exterior and fluid retention syndrome

phlegm-turbid obstruction lung syndrome

phlegm-heat obstructing lung syndrome

wind-phlegm blocking lung syndrome

blood stasis syndrome

lung Qi deficiency syndrome

lung and spleen Qi deficiency syndrome

lung and kidney Qi deficiency syndrome

lung and kidney Yang deficiency syndrome

and sudden loss of Yang-Qi syndrome. At the same time

syndrome differentiation was conducted by experienced Chinese medical experts

and the results from both investigation and clinical experts were compared.Sensitiveness

specificity

accuracy

positive predictive value

negative predictive value

positive likelihood ratio

negative predictive value

and area under the curve were selected as the evaluation indices. Results Three hundred questionnaires were distributed and they were all returned back as valid ones. Among them

there were 200 in acute attack

30 in chronic persistent stage

and 70 in clinical remission. Among 10 common syndromes with sensitiveness range of 78. 26%- 98. 48%

blood stasis syndrome was with the highest sensitiveness（ 98. 48%） and sudden loss of Yang-Qi syndrome with the lowest sensitiveness（ 78. 26%）; the specificity range was 90. 64%- 99. 15% and blood stasis syndrome was with the highest specificity among them（ 99. 15%）; the accuracy range was 90. 67%-99. 00% and blood stasis syndrome was with the highest accuracy among them（ 99. 00%）; the positive predictive value range was 60. 98%- 97. 01%; the negative predictive value range was 95. 38%- 99. 57%; the positive likelihood ratio range was 9. 70- 115. 23; and the negative likelihood ratio range was 0. 02- 0. 23. The range of area under the curve of receiver operating characteristic was 0. 803- 0. 954

and the area under the curve of blood stasis syndrome was the biggest one（ 0. 954）

followed by that of phlegm-heat obstructing lung syndrome（ 0. 913） and phlegm-turbid obstruction lung syndrome（ 0. 901）. Areas under the curve of lung and kidney Qi deficiency syndrome（ 0. 803） and sudden loss of Yang-Qi syndrome（ 0. 809） were small. Conclusion The diagnostic criterion of syndrome of bronchial asthma has good sensitiveness

specificity and accuracy. The diagnostic efficiency of the criterion is better for excess syndromes than for deficiency syndromes. In excess syndrome

blood stasis syndrome is with the best diagnosis efficiency

followed by phlegm-heat obstructing lung syndrome and phlegm-turbid obstruction lung syndrome.