Characteristics of HCV antibody negative PWID by year of enrolment in the VIDUS cohort between 1996 and 2012 in Vancouver, Canada (n = 364).

Percentages indicate column percentages;
*At the time of enrolment;
†in the last 6 months prior to enrolment;
¶p-value for association (Fisher’s exact test for categorical variables, Kruskal-Wallis Test for continuous variables);
§p-value for trend (Cochran-Armitage test for categorical variables, linear regression for continuous variables).

百分比均为列百分比；
* 入组时；
† 入组前6个月内；
¶ 关联性P值（分类变量采用费希尔精确检验，连续变量采用克鲁斯卡尔-沃利斯检验）；
§ 趋势性P值（分类变量采用科克兰-阿米蒂奇检验，连续变量采用线性回归分析）。