Efficacy and prognostic analysis of carbon nanotracers combined with the da Vinci robot in the treatment of esophageal cancer

Figure 2 Comparison between the observation and control groups. A: Operation time; B: Recurrent laryngeal nerve lymph node dissection time; C: Intraoperative blood loss; D: Number of dissected lymph nodes. ^aP < 0.05, indicates statistically significant difference between the two groups; ^bP < 0.01, indicates statistically significant difference between the two groups.