Table 3.
ANOVA results (a) and multiple comparisons among mean values and range of data variation (minimum and maximum values) for each surfaces and variables analyzed (b) after routine cleaning and sanitation of food contact surfaces.
| a. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sources of Variation | df | RLU | TMA | C | |||||||||
| Surfaces | 9 | *** | *** | *** | |||||||||
| Time | 39 | ns | ns | ns | |||||||||
| Error | 351 | ||||||||||||
| b. | |||||||||||||
| Surface | RLU/100 cm2 | TMA cfu/100 cm2 | Coliforms cfu/100 cm2 | Ec cfu/100 cm2 | |||||||||
| Min | Max | Means * | Min | Max | Means * | Min | Max | Means * | |||||
| Raw meat preparation table | 18 | 1,568 | 183.05 b | n.d. | 1.1 × 104 | 3.6 × 102b | n.d. | n.d. | n.d. | n.d. | |||
| Raw meat chopping-board | 41 | 451,593 | 59,548.05 a | n.d. | 4.8 × 105 | 4.1 × 104a | n.d. | 1.8 × 102 | 7.0 × 10 b | n.d. | |||
| Raw meat knife | 25 | 7,713 | 843.02 b | n.d. | 1.1 × 104 | 9.7 × 102b | n.d. | 7.3 × 102 | 2.0 × 10 b | n.d. | |||
| Raw vegetable preparation table | 35 | 12,695 | 811.37 b | n.d. | 8.2 × 103 | 7.1 × 102b | n.d. | 3.0 × 102 | 2.0 × 10 b | n.d. | |||
| Raw vegetable knife | 37 | 30,770 | 3,181.30 b | n.d. | 1.0 × 105 | 5.9 × 103b | n.d. | 1.5 × 102 | 1.0 × 10 b | n.d. | |||
| Vegetable washer | 11 | 3,041 | 332.45 b | n.d. | 2.3 × 104 | 7.1 × 102b | n.d. | n.d. | n.d. | n.d. | |||
| Multipurpose chopping-board | 90 | 35,864 | 4,105.57 b | n.d. | 1.0 × 105 | 8.1 × 103b | n.d. | 4.7 × 103 | 2.2 × 102a | n.d. | |||
| Cooked meat slicing machine | 27 | 2,855 | 437.43 b | n.d. | 1.3 × 103 | 1.3 × 102b | n.d. | n.d. | n.d. | n.d. | |||
| Table for customers | 25 | 4,243 | 526.32 b | n.d. | 2.2 × 102 | 1.0 × 10 b | n.d. | n.d. | n.d. | n.d. | |||
| Knife for customers | 9 | 934 | 163.95 b | n.d. | 2.8 × 102 | 1.0 × 10 b | n.d. | n.d. | n.d. | n.d. | |||
Notes: In panel a: df = degrees of freedom; ns = not significant; *** = significant at p < 0.001. In panel b: * For each variable means followed by different letters are significantly different (p < 0.05) RLU Relative Light Units; TMA Total Mesophilic Aerobes; Ec Escherichia coli; n.d. not detected (no colonies were grown on plates inoculated with 1 mL of undiluted sample).