Table 3.

Thickness of biofilms formed by bacterial species on silicone hydrogel contact lenses

Species	Mean ± SD	95% Confidence Interval for Mean		P – value (versus)
		Lower Bound	Upper Bound	P. aeruginosa	S. marcescens	S. aureus
P. aeruginosa	57.33 ± 3.05	49.74	64.92	-	.002	<.001
S. marcescens	43.33 ± 3.51	34.60	52.05	.002	-	.018
S. aureus	34.00 ± 1.00	31.51	36.48	<.001	.018	-

SD – Standard deviation.