Table 3. Relationship between serum prolidase activity and clinical characteristics and laboratory parameters.

	Pearson's correlation coefficient	P value	β-Regression coefficient*	P value
Tonnis grade of DDH	0.775	<0.001	0.711	<0.001
LOOH (µmol/l)	0.377	<0.001
TOS (µmol H2O2 equiv./l)	0.462	<0.001	0.675	0.040
OSI (arbitrary units)	0.568	<0.001	0.789	0.042
Total –SH (mmol/l)	–0.467	<0.001
TAC (mmol Trolox equiv./l)	–0.408	<0.001

*From multiple linear regression.

LOOH, lipid hydroperoxide; TOS, total oxidant status; OSI, oxidative stress index; –SH, free sulfhydryl groups; TAC, total antioxidant capacity.