Table 1. Demographic and biochemical data on the group.

	Patient group (n = 76)	Control group (n = 78)	t and x2 value	P value
Age, year	11.22 ± 2.08	12.15 ± 1.04	3.2	0.230
Sex, female (%)	45	49	0.005*	0.123
TAS (mequiv. Troloks/l)	0.73 ± 0.17	0.95 ± 0.17	−8.10	<0.001
TOS (mmol H2O2/l)	37.29 ± 8.51	27.34 ± 7.11	7.75	<0.001
OSI, arbitrary unit	5.47 ± 1.52	2.97 ± 0.96	11.84	<0.001
Paraoxonase activity (U/l)	142.30 ± 47.16	167.55 ± 49.50	−3.17	0.002
Arylesterase activity (U/l)	94.59 ± 19.14	102.51 ± 18.59	−2.61	0.010

Table obtained from the data of independent t-test and chi-square. P < 0.05 was considered significant.

*χ² values.

OSI, oxidative stress index; TOS, total oxidant status; TAS, total antioxidant status.