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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)