Table A2.

The statistical analysis relative to strain invasiveness was performed by comparing the rate of infection of each strain with the rate of infection of ATCC12598 as control for cell culture method at 3 hr p.i., using t test, p value and 95% of confidence

t Test	ATCC12598‐ST30	ST239‐SCCmecIII	ST5‐SCCmecII	ST8‐SCCmecIV	ST228‐SCCmecI	ST22‐SCCmecIVh
Rate of Infection CFU/infected MG‐63	3.2 × 106 ± 3.7 × 105	2.7 × 106 ± 2.8 × 104	3.3 × 106 ± 5.8 × 105	2.4 × 106 ± 1.4 × 105	2.8 × 106 ± 6.3 × 105	4.3 × 106 ± 6.8 × 105
p value	—	.2548	.9819	.0932	.6016	.2394
95% confidence interval	—	−1.545 × 106 to 5.455 × 105	−1.904 × 106 to 1.937 × 106	−2.001 × 106 to 2.34 × 105	−2.461 × 106 to 1.627 × 106	−1.095 × 106 to 3.26 × 106