The intervention had the greatest influence on the Chinese subgroup , which had improved scores relative to the control group for perceived behavior control and intentions ( preintervention vs postintervention change : control group , -0.16 ; intervention group , 0.11 ; P = .004 ) , behavioral beliefs on cancer screening ( preintervention vs postintervention change : control group , -0.06 ; intervention group , 0.24 ; P = .0001 ) , and attitudes toward behavior ( preintervention vs postintervention change : control group , -0.24 ; intervention group , 0.35 ; P .0001 ) .