Table 1.

The characteristics of the eleven studies included in meta-analysis

Study	Country	Number of controls	Number of OLP patients	Sex of controls, M : F	Sex of OLP patients, M : F	Mean age of controls	Mean age of OLP patients
Gu, 2004 [2]	USA	10	10	3 : 7	1 : 9	62.5	64.1
Goel, 2015 [5]	India	10	42	Matched	8 : 7	Matched	46.9
Rhodus, 2005 [13]	USA	13	13	0 : 13	0 : 13	58	57
Rhodus, 2006 [14]	USA	13	13	Matched	0 : 13	Matched	57.2
Sun, 2005 [15]	Taiwan	54	158	4 : 5	43 : 115	NR	51.3
Sun, 2002 [16]	Taiwan	77	149	32 : 45	46 : 103	45	53
Liu, 2011 [17]	China	43	21	4 : 17	15 : 28	60.4	57.3
Zhang, 2008 [18]	China	30	30	1 : 1	8 : 7	40	45
Rhodus, 2005 [19]	USA	13	13	3 : 10	4 : 9	58	57
Kaur, 2015 [20]	Belgium	50	54	–	–	Matched	Matched
Yamamoto, 1994 [21]	Japan	20	26	1 : 1	3 : 10	34.9	61.2

NR – not reported, M : F – male to female, OLP – oral lichen planus