Table 3.

Effect of Irradiation Time on Phototoxicity of TBO against Bacterial Cells

Irradiation Time, Minutes	S. epidermidis			S. aureus
	Survival Fraction, N/N0	t	P	Survival Fraction, N/N0	t	P
0	1	–	–	1	–	–
5	0.274 ± 0.073	6.858	<0.001	0.466 ± 0.052	5.242	<0.001
10	0.115 ± 0.023	7.170	<0.001	0.365 ± 0.030	2.421	0.005
20	0.042 ± 0.032	2.885	0.004	0.245 ± 0.021	3.138	0.003
30	0.021 ± 0.028	3.242	0.003	0.149 ± 0.022	8.912	<0.001
40	0.014 ± 0.031	1.694	0.083	0.108 ± 0.031	1.232	0.261
F	4.691			8.852
P	<0.001			<0.001