In terms of the rate of food control input, that of canteens belonging to the contracted cooking type was higher than that of canteens ofthe self-organized cooking type (PR = 1, 4, 95% CI (1, 1 - 2, 1)), the large scale canteens (over 500 meals / day) achieved a higher rate than did smaller scale canteens (PR=1, 3, 95% CI (1, 1 - 1, 7)).