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Table 4 Endoscopic findings between progression and non-progression groups

From: Natural history of superficial head and neck squamous cell carcinoma under scheduled follow-up endoscopic observation with narrow band imaging: retrospective cohort study

  Progression Non- Progression
n = 17 n = 3
Endoscopic follow-up period, median (range), months 21 (6–71) 13 (6–20)
Number of endoscopic examinations, median (range) 5 (1–10) 2 (2–5)
Time of tumor progression, median (range), months 10 (3–29)  
Number of submucosal invasion, (%) 9 (53)  
Time to submucosal invasion, median (range), months 21 (11–58)