Table 2.

Mean and standard deviation of wear scar diameters values (mm)

Group	Mean ± S.D.	P value	Significance at 5% level
I	0.805 ± 0.004	< 0.05	I Vs II, III, IV
II	0.761 ± 0.003	< 0.05	II Vs I, III, IV
III	0.968 ± 0.004	< 0.05	III Vs I, II, IV
IV	1.114 ± 0.070	< 0.05	IV Vs I, II, III