1. Quality control indexes of oral and oropharyngeal cancer in China in 2015.

Areas	Sex	M/I	%
			MV	DCO	UB
M/I, mortality to incidence ratio; MV, morphological verified; DCO, death certificate-only cases; UB, unknown basis.
All areas	Both	0.47	78.97	1.48	0.34
	Male	0.50	78.94	1.51	0.30
	Female	0.40	79.02	1.41	0.42
Urban areas	Both	0.46	81.78	1.76	0.35
	Male	0.50	81.23	1.73	0.27
	Female	0.39	82.87	1.81	0.49
Rural areas	Both	0.48	75.15	1.10	0.33
	Male	0.51	75.92	1.23	0.33
	Female	0.42	73.51	0.82	0.32
Eastern areas	Both	0.46	81.44	1.58	0.33
	Male	0.49	80.76	1.58	0.25
	Female	0.39	82.75	1.58	0.48
Middle areas	Both	0.47	76.61	1.31	0.07
	Male	0.50	78.24	1.35	0.05
	Female	0.42	73.16	1.25	0.11
Western areas	Both	0.51	71.55	1.29	0.84
	Male	0.56	72.01	1.49	0.93
	Female	0.41	70.50	0.84	0.63