TABLE 2.
Statistical analyses of frequency differences of various genetic and phenotypic traits of V. fischeri isolates collected from different host populations on Oahu in 2005
| Test and trait | χ2 | t | df | U | % of cells <5b | P valuea | Fisher's exact test P valuea |
|---|---|---|---|---|---|---|---|
| Chi-square test | |||||||
| VfRep type | 20.4 | 2 | 17 | **** (****) | **** (****) | ||
| Bioluminescence level | 5.5 | 1 | 0 | *** (***) | *** (***) | ||
| Colony pigmentation | 6.7 | 1 | 0 | **** (***) | *** (***) | ||
| Mann-Whitney-Wilcoxon test | |||||||
| Motility rate | 776 | **** (****) | |||||
| Siderophore production | 451 | * (*) | |||||
| Welch t test, growth rate | 2.46 | 50.75 | *** (***) |
a
The correction of P values for multiple testings was performed by considering each test as a family of tests. The P values were analyzed and adjusted according to the method of Hommel (31); corrected values are in parentheses. Ranges of calculated P values: *, P > 0.1; **, 0.1 > P > 0.05; ***, 0.01 < P < 0.05; ****, P < 0.01.
b
The percentage of cells <5 refers to a common benchmark for the validity of χ2 analysis.