highly significantp < 0.001
3.3 Two-way ANOVA A two-way ANOVA on log 10 (CFU+1)-transformed data confirmed highly significant main effects for both surface type [ F (1, 56) = 695.6; p < 0.001; η 2 = 0.741] and culture condition [ F (3, 56) = 55.6; p < 0.001; η 2 = 0.178].