Table 3.

The basic information of specific population study

Publish year Authors	Continent	Country	Total	OLK	Definition	Examination	Biopsy	Age
MAJ Jeffrey A. Grasser 1997 [72]	North America	America(Carolina)	214	5	un	yes	no	18–47
Nicola Pearson 2001 [73]	Europe	England	137	34	WHO 1980	yes	no	≥ 40
Toru Nagao 2003 [74]	Europe	England	484	16	WHO 1980	yes	no	all
Eric Oakley 2005 [75]	North America	America(sapan)	309	40	WHO 1978	yes	no	14–18
A. Ariyawardana 2007 [76]	Asia	Sri Lanka	12,716	41	WHO 1980	yes	yes	≥ 15
M Pentenero 2008 [77]	Europe	Italy	4098	47	WHO 1997	yes	yes	all
Rushabh J Dagli 2008 [78]	Asia	India	513	171	WHO 1980	yes	no	≥ 18
Reto Morger 2010 [79]	Europe	Switzerland	615	8	WHO 1980	yes	yes	18–24
Agbor MA 2013 [80]	Africa	Cameroon	226	19	un	yes	no	40–69
Santhosh Vediyera Chandroth 2014 [81]	Asia	India	979	135	WHO 2013	yes	no	≥ 18
Viviani-Silva Araújo 2015 [82]	South America	Brazil	395	1	WHO 1997	yes	un	un
Anzil KS Ali 2017 [83]	Asia	India	2163	319	un	yes	no	15–54
Punith Shetty 2017 [84]	Asia	India	450	20	un	yes	un	> 18
Nisha Rani Yadav 2018 [85]	Asia	India	464	70	un	yes	un	65–74
Shrikanth Muralidharanl 2018 [86]	Asia	India	350	110	WHO 1997	un	no	> 18
Afolabi Oyapero 2020 [87]	Afirca	Nigeria	144	5	un	yes	no	> 18
Yunus G.Y. 2021 [88]	Asia	India	185	51	un	yes	no	aver = 45
Choudhury AR 2022 [89]	Asia	India	451	31	WHO 2013	yes	un	24–60
Sandeep Kumar 2022 [90]	Asia	India	453	60	WHO 1997	yes	no	18–54

Abbreviations: un unclear, aver average