Table 6

Duncan's multiple range test for the data from Table 4

α
0.05
Error degrees of freedom
396
Error mean square
208.9133
Number of means
2
3
4
Critical range
4.019
4.231
4.372
Duncan groupinga
Mean
N

Infection group
A
40.887
100

4
A
39.485
100

2
A
39.390
100

3
B
35.245
100

1

aMeans with the same letter are not significantly different.

Bewick et al. Critical Care 2004 8:130   doi:10.1186/cc2836