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Table 2 Subjective qualitative evaluation of 3D endoscope system

From: Three-dimensional minimally invasive video-assisted thyroidectomy: preliminary report

Surgeons Recognition of structures
Upper vascular pedicle Lower vascular pedicle Parathyroids Superior laryngeal nerve Inferior laryngeal nerve In presence of blood
No. 1 5 5 5 5 5 2
No. 2 5 5 5 5 5 2
No. 3 5 4 4 4 4 1
  1. Score 5: very easy; score 4: easy; score 3: normal; score 2: difficult; score 1: very difficult.