Table 1 The SPIRIT flow diagram: the schedule of enrollment, interventions, and assessments. t₁ is the beginning of anesthesia. t₂ is the ending of anesthesia. t₃ is 24 h after operation. t₄ is 48 h after operation. t₅ is 7 days after operation. t₆ is discharge or 30 days after operation, depending on which one occurs first

From: Effects of intraoperative goal-directed fluid therapy and restrictive fluid therapy combined with enhanced recovery after surgery protocol on complications after thoracoscopic lobectomy in high-risk patients: study protocol for a prospective randomized controlled trial