Table 3.

Summary of α diversity and β diversity of each group.

Procedure of analysis	OSCC, OLK, post, control	OSCC early vs late
Degree of α diversity
1. PD whole tree	control>OSCC = OLK>Post	late>early
2. chao1	control>OSCC = OLK>Post	late>early
3. observed species	control>OSCC = OLK>Post	late>early
4. shannon	control = OSCC>OLK = Post	late>early
Difference of β diversity
1. Unweighted Unifrac	-	-
2. Weighted Unifrac	+	+

Abbreviations: OSCC: oral squamous cell carcinoma; OLK: oral leukoplakia; Post: post operative of OSCC; early: stage I/II; late: stage III/IV.