Table 2.

Comparison of the three groups with respect to blood superoxide dismutase enzyme levels.

Group	Mean	SD
I	4.96	2.91	F = 35.2838
II	10.92	4.69	p = 0.0000*
III	19.09	9.89
Pair-wise comparison is by Tukey's HSD post hoc procedures
Control vs. nonsmokers			0.0020*
Control vs. smokers			0.0001*
Nonsmokers vs. smokers			0.0001*

*Indicates 5% level of significance (p < 0.05).

HSD = honest significant difference.