Factors associated with primary HIV drug resistance by duration of HIV infection - univariate logistic regression.

Abbreviations: HBsAg – hepatitis B surface antigen, anti-HCV – antibody to hepatitis C virus. *p-value is for test for trend (excluding missing values) for age groups, CDC category, and HIV RNA.缩写说明：HBsAg——乙型肝炎表面抗原（hepatitis B surface antigen），抗-HCV——丙型肝炎病毒抗体（antibody to hepatitis C virus）。*p值用于年龄组、CDC分类以及HIV RNA的趋势检验（排除缺失值）。