Vascular access and clinical events during follow-up period.

Timing of restenosis or re-intervention: early, within 3 months; late, within 4–12 months; P for Chi-square test.再狭窄或再次干预的发生时机：早期为3个月内，晚期为4~12个月；所用P值通过卡方检验（Chi-square test）计算得到