Table 4.

Analysis of variance testing the main effects of successful invasion of S. aureus into populations of S. epidermidis. The table shows the results of a multifactorial anova. Both main effects and interactions are shown

	df	Sum sq	Mean sq	F value	P value
Frequency	1	2.721	2.721	8.1457	0.005810**
Structure	1	2.949	2.949	8.8266	0.004177**
Inhibition	1	41.744	41.744	124.9525	<2.2e-16***
Frequency × Structure	1	0.007	0.007	0.0198	0.88449
Frequency × Inhibition	1	15.554	15.554	46.5589	3.794e-09***
Structure × Inhibition	1	2.051	2.051	6.1382	0.015880*
Frequency × Structure × inhibition	1	0.398	0.398	1.1900	0.279418

df, Degrees of freedom; Sum sq, sum of squares; Mean sq, Mean of squares; F value, F statistic for terms in the row; P value, significance.

Asterisks indicate the significance levels at different thresholds. ^*P < 0.05; ^**P < 0.01, ^***P < 0.001.