. 2020 Jul 16;15(7):e0236199. doi: 10.1371/journal.pone.0236199

Table 2. Effect of narrow-band UVA light on bacteria based on time exposure using varying intensities at 1 cm from the target.

Microorganism	UVA Intensity (μW/cm²)	Group	Baseline	20 min	% Reduction	Log Reduction	P value	40 min	% Reduction	Log Reduction	P value
Microorganism	UVA Intensity (μW/cm²)	Group	CFUx10⁷/mL	CFUx10⁷/mL	% Reduction	Log Reduction	P value	CFUx10⁷/mL	% Reduction	Log Reduction	P value
Escherichia coli GFP	500	Exposed	0.25	0.16	32.87	0.17	0.26	0.13	53.80	0.34	0.06
	500	Control	0.25	0.24	32.87	0.17	0.26	0.28	53.80	0.34	0.06
	1000	Exposed	0.14	0.12	20.97	0.10	0.38	0.08	55.50	0.35	0.01
	1000	Control	0.14	0.15	20.97	0.10	0.38	0.18	55.50	0.35	0.01
	2000	Exposed	0.26	0.14	41.96	0.24	0.17	0.04	86.77	0.88	0.01
	2000	Control	0.26	0.23	41.96	0.24	0.17	0.30	86.77	0.88	0.01
	3000	Exposed	0.19	0.02	89.09	0.96	<0.001	No growth	^*	^*	0.01
	3000	Control	0.19	0.15	89.09	0.96	<0.001	0.19	^*	^*	0.01
Pseudomonas aeruginosa	500	Exposed	0.49	0.27	24.79	0.12	0.17	0.24	-23.87	-0.09	0.47
	500	Control	0.49	0.36	24.79	0.12	0.17	0.19	-23.87	-0.09	0.47
	1000	Exposed	0.49	0.24	25.24	0.13	0.01	0.10	37.07	0.20	<0.001
	1000	Control	0.49	0.40	25.24	0.13	0.01	0.32	37.07	0.20	<0.001
	2000	Exposed	0.28	0.06	69.07	0.51	0.17	0.03	78.37	0.67	0.05
	2000	Control	0.28	0.20	69.07	0.51	0.17	0.14	78.37	0.67	0.05
	3000	Exposed	0.40	0.07	77.42	0.65	<0.001	0.02	89.23	0.97	0.01
	3000	Control	0.40	0.32	77.42	0.65	<0.001	0.22	89.23	0.97	0.01

* No growth observed. Bactericidal threshold of >99.9% or 3 log reduction is met.