Type of dish

Total no. samples

99% confidence intervals (ppm)

Proportion (%) > 20 ppm

Bread-Wheat flour substitute

3

2.85 - 13.72

0

Cold meat

6

2.78 - 3.49

0

Corn meal

3

3.66 - 16.89

0

Corn meal with vegetables

3

0.39 - 3.31

0

Corn meal with meat

11

0.26 - 1.08

0

Costa Rican food (without sauce)

12

1.07 - 2.53

0

Fry food

8

0.19 - 2.93

0

Meat with sauce

10

74.41 - 104.63

100

Pasta

3

0.58 - 3.57

0

Rice dishes

9

0.90 - 7.75

0

Salad (vegetables only)

3

4.14 - 11.56

0

Salad with meat

3

1.16 - 5.37

0

Sea food

9

0.10 - 3.19

0

Vegetarian with sauce

3

0.70 - 14.42

0