Table 1. Distribution of the cfu counts phenotype in the 98 (B6 × D2) F₂ population.

Trait	n	Mean	SD	Skewness	Kurtosis	Normality test, D*	Normality test, P*
cfu counts	98	6.89	0.46	-0.25	0.12	0.068	>0.15
Female cfu counts	39	6.57	0.40	-0.37	-0.35	0.095	>0.15
Male cfu counts	59	7.11	0.35	0.30	-0.62	0.100	>0.14
Sex adjusted cfu counts	98	0.00	0.37	-0.03	-0.43	0.068	>0.15

^*Normality tests conducted by using the Kolmogorov-Smirnov test, as implemented in the SAS computer package (43).