Table 2.

Clinical and histopathological grade details for the older group

Authors	Old cases (n)	Male (n)	Female (n)	Site -tongue (n)	Other site total (n)	Tobacco users (n)	HPG WD (n)	HPG MD (n)	HPG PD (n)
Zhang et al.[3]	227	117	110	227	0	85	-	-	13
Fang et al.[4]	161	113	48	161	0	109	85	36	40
Khammissa et al.[5]	501	352	112	187	314	-	29	398	74
Troeltzsch et al.[6]	34	23	11	4	30	11	2	27	5
Sun et al.[7]	399	277	122	161	238	252	204	104	91
Naz et al.[8]	68	-	-	17	51	-	20	36	12
Komalmalai et al.[9]	838	494	344	309	529	502	487	235	62
Frare et al.[10]	14	11	3	9	5	8	2	11	1
Blanchard et al.[11]	50	39	11	50	0	46	40	9	1
Jeon et al.[12]	94	51	43	94	0	41	59	27	5
Kapila et al.[13]	19	14	5	-	-	11	3	12	4
Mahmood et al.[14]	75	49	26	13	62	-	12	56	7
Mukdad et al.[15]	15191	8895	6296	15191	0	-	3823	7123	2186
Xu et al.[16]	2608	2379	229	1039	1568	1060	1126	1240	124
Costa et al.[17]	39	30	9	22	17	31	23	14	2
Oliver et al.[18]	20664	12502	8162	20664	0	-	366	850	248
Teixeira et al.[19]	40	35	5	14	26	36	13	23	4
Zhang et al.[20]	103	53	50	53	50	10	40	52	11
Goepfert et al.[21]	36	25	11	36	0	20	11	18	7
Cariati et al.[22]	100	66	34	35	65	87	8	66	26
Abdulla et al.[23]	334	213	109	42	258	220	128	130	18
Farquhar et al.[24]	280	169	110	280	0	192	-	-	-
Choi et al.[25]	138	87	51	138	0	48	71	54	13
Campbell et al.[26]	282	171	111	282	0	192	58	166	33

NS: Not specified; -: Data not available; HPG: Histopathological grade; WD: Well differentiated; MD: Moderately differentiated; PD: Poorly differentiated