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 , -@ ; intervention group , @ ; P = @ ) , behavioral beliefs on cancer screening ( preintervention vs postintervention change : control group , -@ ; intervention group , @ ; P = @ ) , and attitudes toward behavior ( preintervention vs postintervention change : control group , -@ ; intervention group , @ ; P @ ) .