Table 1.

Characteristics of participants and study groups

Study group	Participants	Final number of samples∗	Smoker	Consumption of preservative-containing food†
Chemical company workers	61	57	31	8
Police officers	52	51	12	5
Urban residents	73	69	22	12
Rural residents	75	71	21	1

^∗Both morning and evening samples were provided correctly.

^†Eating a meal containing sorbic acid-preserved foods within 24 hours prior to sampling.