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. 2018 May 14;13(5):e0196555. doi: 10.1371/journal.pone.0196555

Table 1. Median and range for log₁₀ MBP cell counts (cfu/mL) in washing water of control and treated plastic, metal, nylon, rubber, and wood substrates with aqueous O₃ of 2, 4, and 9 ppm for 2, 4, 8 minutes.

Dose	Exposure time
	2 min		4 min		8 min
	Control	O₃	Control	O₃	Control	O₃
Plastic
2.0 ppm	6.1 (5.5,6.8)^a	3.4 (2.0,4.0)^*^a	5.9 (5.5,6.4)	2.8 (0.0,3.1)^*	6.6 (5.7,6.9)	3.1 (2.3,3.5)^*
4.0 ppm	6.4 (6.1,6.9)^a	0.0^*^b
Metal
2.0 ppm	7.1 (7.1,7.3)^a	4.6 (4.1,4.9)^*^a	5.9 (5.4,6.1)^a	3.1 (0.0,3.7)^*^a	6.8 (5.6,6.8)^a	3.4 (3.1,3.9)^*^a
4.0 ppm	7.1 (6.9,7.2)^a	2.4 (0,4.1)^*^b	7.2 (6.3,7.3)^b	1.6 (0,3.2)^*^b	7.1 (6.3,7.3)^a	2.4 (0,2.7)^*^b
9.0 ppm	7.1 (6.3,7.3)^a	0.0^*^c
Nylon
2.0 ppm	6.0 (5.7,6.7)^a	4.3 (3.6,4.8)^*^a	5.6 (5.4,6.2)^a	3.7 (2.9,4.8)^*^a	5.6 (5.2,6.7)^a	3.2 (2.8,3.8)^*
4.0 ppm	5.7 (5.0,6.7)^a	2.8 (1.9,3.3)^*^b	5.4 (5.1,6.0)^a	2.6 (1.3,2.9)^*^b	5.8 (4.8,6.6)^a	2.6 (0.0,3.3)^*
9.0 ppm	6.0 (4.7,6.9)^a	0.0^*^c
Rubber
2.0 ppm	6.0 (5.9,6.2)^a	5.2 (4.9,5.6)^*^a	6.1 (5.6,6.8)^a	5.0 (4.9,5.8)^*^a	6.6 (6.2,6.7)^a	5.8 (5.1,6.0)^*^a
4.0 ppm	6.8 (6.5,6.9)^a	4.1 (3.6,4.3)^*^b	6.7 (6.1,6.8)^a	3.5 (3.2,3.7)^*^b	6.7 (6.3,6.9)^a	3.5 (3.1,3.6)^*^b
9.0 ppm	6.6 (6.4,6.8)^a	3.0 (2.6,3.6)^*^c	6.7 (6.2,6.9)^a	2.5 (0.0,3.0)^*^c	6.6 (5.9,6.8)^a	1.3 (0.0,3.0)^*^c
Wood
2.0 ppm	6.3 (5.9,6.4)^a	5.6 (4.9,6.3)^*^a	6.1 (5.5,7.0)^a	5.0 (3.9,5.3)^*^a	6.4 (5.6,6.8)^a	5.1 (4.7,5.7)^*^a
4.0 ppm	7.1 (6.8,7.3)^b	6.0 (5.7,6.2)^*^a	7.0 (6.3,7.3)^b	5.3 (4.6,6.0)^*^a	7.2 (6.3,7.3)^b	5.2 (4.9,5.8)^*^a
9.0 ppm	5.9 (4.3,6.6)^a	3.6 (3.1,3.8)^*^c	6.7 (6.6,6.8)^a ^b	3.5 (2.8,3.7)^*^b	6.8 (6.2,6.9)^a ^b	3.0 (2.4,3.8)^*^b

*Values within a row are significantly different between control and treated groups for each time point.

^a-cValues with different letters within a column for each material are significantly different.