Among patients eligible for the study , @ ( @ % ) took a fecal occult blood test after being invited ; @ ( @ % ; @ % confidence interval -LSB- CI -RSB- , @-@ @ ) in the intervention group and @ ( @ % ; @ % CI , @-@ @ ) in the control group , with no statistical difference between the @ groups ( odds ratio @ ; @ % CI , @-@ @ ; P = @ ) .