Table 1.

Study sample characteristics of systematic reviews and meta-analyses included in this scoping review.

Total Sample	12 Studies
Date of publication
Range Min (year)	2006
Range Max (year)	2022
Study design
systematic review	7
systematic review and meta-analysis	5
Study population
OSCC	10
HNSCC *	2
Primary-level studies included in systematic reviews
Range min (n)	8
Range max (n)	63

* Stratified results were reported for oral cancer. Abbreviations: OSCC, oral squamous cell carcinoma; HNSCC, head and neck squamous cell carcinoma.