TABLE 1.

Statistical analysis of the plaque size data^a

MDV	P value for plaque size of MDV pair
	v20	v20ΔgC	v20ΔgC-R	v20ΔMgC	v20ExpgC	v20ExpΔMgC
v20		<0.0001	0.1733	0.0013	<0.0001	0.5372
v20ΔgC	<0.0001		0.0002	0.0204	<0.0001	<0.0001
v20ΔgC-R	0.1723	0.0002		0.0693	<0.0001	0.3647
v20ΔMgC	0.0013	0.0202	0.0688		<0.0001	0.0032
v20ExpgC	<0.0001	<0.0001	<0.0001	<0.0001		<0.0001
v20ExpΔMgC	0.5350	<0.0001	0.3628	0.0032	<0.0001

^aPlaque areas were analyzed by analysis of variance using SAS version 8.2 for Windows software (59). Data sets were compared, and P values for the plaque sizes of pairs of MDV mutants were determined by the two-sided Wilcoxon two-sample test for normal approximation (values above the diagonal) or by the Kruskal-Wallis test (values below the diagonal). Multiple testing required the adjustment of α to 0.0033 (0.05/15). Therefore, only P values of <0.0033 were considered significant.