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Table 1 Combinations of divalent metal cations in a factorial design of experiment (Fig. 7)

From: Virus matrix interference on assessment of virucidal activity of high-touch surfaces designed to prevent hospital-acquired infections

Combination Copper Zinc Nickel Log difference
Unfiltered Filtered
Center point Mid Mid Mid − 2.62 − 3.76
A High High High − 3.57 − 4.72
B Low High High − 1.23 − 1.24
C High Low High − 3.26 − 4.79
D Low Low High − 0.52 − 1.23
E High High Low − 3.02 − 4.81
F Low High Low − 0.04 − 0.01
G High Low Low − 3.42 − 4.78
H Low Low Low 0.00 − 0.01