Table 2. Statistical analysis of S. enterica crystal violet attachment assays on glass and polystyrene surfaces.

Strain	ST LT2 WTa		SP WTb
	Glass	Polystyrene	Glass	Polystyrene
mutants
S. Typhimurium LT2 ΔycfR::cat	0.0063c	0.021
S. Typhimurium LT2 ΔyigG::cat	NS	0.0003
S. Typhimurium LT2 ΔsirA::cat	0.0007	0.009
complements
S. Typhimurium LT2 ΔycfR::cat (pJS-8)	0.023	NS
S. Typhimurium LT2 ΔyigG::cat (pJS-16)	NS	0.006
S. Typhimurium LT2 ΔsirA::cat (pJS-18)	NS	0.040
mutants
S. Saintpaul ΔycfR::cat			0.035	NS
S. Saintpaul ΔyigG::cat			NS	0.020
S. Saintpaul ΔsirA::cat			0.0025	<0.0001
complements
S. Saintpaul ΔycfR::cat (pJS-10)			NS	NS
S. Saintpaul ΔyigG::cat (pJS-16)			NS	NS
S. Saintpaul ΔsirA::cat (pJS-18)			NS	0.010

^aST LT2 wild type strain under the same condition is used as a reference in t-test analysis.

^bSP wild type strain under the same condition is used as a reference in t-test analysis.

^cAll values are given as probability (P). P>0.05 indicates not significant (NS).