The molecular electronegativity-distance vector (MEDV) was used to describe the molecular structure of volatile components of Rosa banksiae Ait, and QSRR model was built up by use of multiple linear regression (MLR...The molecular electronegativity-distance vector (MEDV) was used to describe the molecular structure of volatile components of Rosa banksiae Ait, and QSRR model was built up by use of multiple linear regression (MLR). Furthermore, in virtue of variable screening by the stepwise multiple regression technique, the QSRR models of 10 and 6 variables and linear retention index (LRI) 10, 7 and 6 varieables were built up by combinating MEDV with the Ultra2 column GC retention time (tR) of 53 volatile components of Rosa Banksiae Air. The multiple correlation coefficients (R) of modeling calculation values of QSRR model were 0.906, 0.906, 0.949, 0.943 and 0.949, respectively. The cross-verification multiple correlation coefficients (RCV) were 0.903, 0.904, 0.867, 0.901 and 0.904, respectively. The results show that the models constructed could provide estimation stability and favorable predictive ability.展开更多
目的了解深圳市青少年变性鼻炎及下呼吸道疾病流行病学特征。方法2007年7月~12月间随机选择深圳市区五所中学初三年级(14-15岁)学生为研究对象,设计深圳市青少年呼吸道疾病问卷调查表,调查分二个阶段:①问卷调查阶段,②据问卷调查...目的了解深圳市青少年变性鼻炎及下呼吸道疾病流行病学特征。方法2007年7月~12月间随机选择深圳市区五所中学初三年级(14-15岁)学生为研究对象,设计深圳市青少年呼吸道疾病问卷调查表,调查分二个阶段:①问卷调查阶段,②据问卷调查结果筛选出变应性鼻炎可疑对象并进行专科检查及确认。将结果进行统计学处理。结果发放调查问卷865份,回收828份,应答率96%,有效问卷796份。深圳市14-15岁青少年变应性鼻炎现患率为18.1%(144/796),其中男8.7996(70/796),女9.3096(74/796)。男女发病率无差异(P〉0.05)按ARIA(Allergic rhinitis and its impact on asthma)2001年分类标准:持续性发作19.4%(28/144),其中轻度发作8.33%(12/144),中-重度发作11.11%(16/144);间歇性发作80.6%(116/144),其中轻度发作48.7%(70/144),中-重度发作31.9%(46/144)。其中有26名患者(26 /144,18.01%)合并支气管哮喘,比56例非变应性鼻炎青少年合并支气管哮喘的现忠率高(3/56,5.36%),差异具有统计学意义(P〈0.05);70名患者(70/144:48.7%)有家族过敏史;环境因素中家庭吸烟诱发症状不用忽视。结论深圳市14-15岁青少年现忠率为18.1%,与支气管哮喘密切相关,因此要特别重视上下呼吸道疾病的一致性和治疗的统一性。展开更多
文摘The molecular electronegativity-distance vector (MEDV) was used to describe the molecular structure of volatile components of Rosa banksiae Ait, and QSRR model was built up by use of multiple linear regression (MLR). Furthermore, in virtue of variable screening by the stepwise multiple regression technique, the QSRR models of 10 and 6 variables and linear retention index (LRI) 10, 7 and 6 varieables were built up by combinating MEDV with the Ultra2 column GC retention time (tR) of 53 volatile components of Rosa Banksiae Air. The multiple correlation coefficients (R) of modeling calculation values of QSRR model were 0.906, 0.906, 0.949, 0.943 and 0.949, respectively. The cross-verification multiple correlation coefficients (RCV) were 0.903, 0.904, 0.867, 0.901 and 0.904, respectively. The results show that the models constructed could provide estimation stability and favorable predictive ability.
文摘目的了解深圳市青少年变性鼻炎及下呼吸道疾病流行病学特征。方法2007年7月~12月间随机选择深圳市区五所中学初三年级(14-15岁)学生为研究对象,设计深圳市青少年呼吸道疾病问卷调查表,调查分二个阶段:①问卷调查阶段,②据问卷调查结果筛选出变应性鼻炎可疑对象并进行专科检查及确认。将结果进行统计学处理。结果发放调查问卷865份,回收828份,应答率96%,有效问卷796份。深圳市14-15岁青少年变应性鼻炎现患率为18.1%(144/796),其中男8.7996(70/796),女9.3096(74/796)。男女发病率无差异(P〉0.05)按ARIA(Allergic rhinitis and its impact on asthma)2001年分类标准:持续性发作19.4%(28/144),其中轻度发作8.33%(12/144),中-重度发作11.11%(16/144);间歇性发作80.6%(116/144),其中轻度发作48.7%(70/144),中-重度发作31.9%(46/144)。其中有26名患者(26 /144,18.01%)合并支气管哮喘,比56例非变应性鼻炎青少年合并支气管哮喘的现忠率高(3/56,5.36%),差异具有统计学意义(P〈0.05);70名患者(70/144:48.7%)有家族过敏史;环境因素中家庭吸烟诱发症状不用忽视。结论深圳市14-15岁青少年现忠率为18.1%,与支气管哮喘密切相关,因此要特别重视上下呼吸道疾病的一致性和治疗的统一性。