Table 1.

Linear regression parameters for normalized ln[S] [survival] values (equation 1) as the dependent variable and UV dose (D, mJ/cm²) as the independent variable. k is the UV inactivation rate constant or susceptibility factor (cm²/mJ). The linear regression was performed with the intercept term set to zero representing the definition of 100% relative survival at zero UV dose. The coronavirus inactivation cross section, D₉₀ (the UV dose that inactivates 90% of the exposed virus) was calculated using D₉₀ = − ln[1 − 0.90]/k.

Human coronavirus type	k (cm2/mJ)	k 95% confidence interval		p value	R2	D90 (mJ/cm2)
		Lower	Upper
HCoV-229E	4.1	2.5	4.8	0.0003	0.86	0.56
HCoV-OC43	5.9	3.8	7.1	0.0001	0.78	0.39