本刊对统计学方法的要求

统计学符号按GB 3358—1982《统计学名词及符号》的有关规定一律采用斜体排印，常用：①样本的算术平均数用英文小写孑(中位数用肘)；②标准差用英文小写s；③标准误用英文小写靠；④￡检验用英文小写t；⑤F检验用英文大写F；⑥膏方检验用希文小写f；⑦相关系数用英文小写r；⑧自由度用希文小写l''；⑨概率用英文大写JP(P值前应给出具体检验值，如￡值、f值、g值等)，P值应给出实际数值，不宜用大于或小于表示，而用等号表示，小数点后保留3位数。

Research on morbidity and relative factors of cough variant asthma among patients with chronic cough syndrome

Objective To study the morbidity of cough variant asthma (CVA) among patients with chronic cough syndrome and its relative risk factors.Methods Patients were recruited with detailed history on their illness. Data were collected on physical examination, chest X-ray, eosinophil cell counts, pulmonary ventilation with histamine stimulating test and bronchi dilation test. According to available data, diagnosis of CVA was confirmed and the relative factors Questionnaire form was completed for each patient.Results Among 473 patients with chronic cough, 95 (44 male and 51 female) were confirmed to be CVA (20.08%). Analysis of the relative factors suggested that CVA was associated with multiple factors. Morbidity of CVA was associated with season, personal histories on allergy and family history on asthma, CVA could be induced by upper respiratory tract infection, inhale of oil vapor, acrimony air, over-burdened physical exercises etc.Conclusion For patients with chronic cough symptom, clear diagnosis of CVA, avoid of passable risk factors and timely medical intervention when necessary, would be helpful in controlling clinical courses and improving the prognosis of the disease.