Figure 2.

Relationship between dishwasher yeast counts and parameters related to the use of dishwasher in ten appliances over four months (r—Spearman coefficient; p—significance level; dashed line—statistically significant differences). Possible answers in the survey: I. frequency of use—1. less often than once a week, 2. once a week, 3. several times a week, 4. once a day, 5. several times a day; II. time to empty the dishwasher after the cycle—1. a long time after completion, 2. a few hours after completion, 3. immediately after completion; III–VII. chemicals used—1. no, 2. yes; VIII. chemical cleaning; IX. mechanical cleaning—1. less often than once a year, 2. once a year, 3. twice a year, 4. quarterly, 5. once a month.