Table A3.

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	ACTT12598‐ST30	ST239‐SCCmecIII	ST5‐SCCmecII	ST8‐SCCmecIV	ST228‐SCCmecI	ST22‐SCCmecIVh
% of internalization ± SD	51.18 ± 1.19	47.82 ± 1.68	26.59 ± 2.05	12.52 ± 3.185	20.25 ± 4.24	50.55 ± 3.71
p‐Value of internalized bacteria recovered from spot counting versus ATCC12598	–	.2876	.038*	.0054***	.0120**	.9077
95% confidence interval	–	4.921 to −11.63	15.01 to −34.16	17.82 to 4.551	12.93 to 48.93	15.28 to −16.54

The table reports the detailed statistical data obtained using t test versus ATCC12598: % of internalization, p‐value and 95% confidence. Statistically significant p‐value ≤.05*; highly significant ≤.01**; extremely significant ≤.001***.

The bold values are statistically significant.