Table 3. Microbial contamination (colony forming units  =  CFUs) of the surface of the tablet computer was determined twice every day, before initial and after final usage (100 users in 11 days).

	Microbial contamination of the surface of the tablet before usage		Microbial contamination of the surface of the tablet after usage
	Min/Max	Mean/SD	Min/Max	Mean/SD
ROI A [CFU]	0/3	0.36 ± 0.92	0/3	0.73 ± 1.01
ROI B [CFU]	0/3	0.36 ± 0.92	0/2	0.45 ± 0.69
ROI C [CFU]	0/0	0	0/3	0.55 ± 1.04

Samples were taken from three defined regions of interest (ROIs; ROI A  =  central touchscreen, ROI B  =  home button and its adjacent area, ROI C  =  upper central backside).