Table 1.

Incidence of CRC in four hospitals in Mexico City. (Modified from [29])

Hospital	Population attended	1978 [%]	2003 [%]	p
Hospital general	Poor uninsured	15	36	<0.001
Hospital 20 de Noviembre	Middle class government employees	20	51	<0.01
Instituto Nacional de CMNSZ	Middle class uninsured	26	39	<0.106
Hospital Español	Upper middle class, European	37	39	ns