Table 1.

Quality control indicators of esophageal cancer in 177 Chinese cancer registries

Areas	Gender	M/I	MV%	DCO%	UB%
ALL	Both	0.76	80.02	2.09	0.16
	Male	0.76	80.25	2.08	0.16
	Female	0.76	79.46	2.13	0.16
Urban	Both	0.81	78.37	2.34	0.26
	Male	0.80	78.92	2.29	0.25
	Female	0.82	76.82	2.47	0.28
Rural	Both	0.73	81.05	1.94	0.10
	Male	0.74	81.15	1.93	0.10
	Female	0.73	80.84	1.96	0.09

DCO, death certificate only; M/I, mortality/incidence; M/V, morphologic verification; UB, uncertified basis.