TABLE 1.

Statistical summary of observed and adjusted viral RNA concentrations (gc/L)

Stage	Group	Positive samples frequency	Mean ± SD	Adjusted mean ± SD	Process log reduction value (average) a
Influent	N1	14/14	(1.98 ± 0.77) × 105	(1.10 ± 0.43) × 106	‐
	N2	14/14	(1.63 ± 1.24) × 105	(9.04 ± 6.92) × 105	‐
Primary effluent	N1	14/14	(2.05 ± 2.16) × 105	(1.14 ± 1.20) × 106	0.21
	N2	14/14	(1.55 ± 1.72) × 105	(8.59 ± 9.58) × 105	0.28
Secondary effluent	N1	4/9	(1.14 ± 0.5) × 103	(1.63 ± 0.71) × 104	1.70
	N2	1/9	2.36 × 103	3.36 × 104	1.45

^a Calculated with adjusted data.