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Table 2 The concentrations of vitamin E, glutathione, iron and TBARs of the patients in all groups

From: Can levels of antioxidants in synovial fluid predict the severity of primary knee osteoarthritis: a preliminary study

	Mild-moderate group	Severe group	P-value
	(KSS >46)	(KSS ≤46)
	n = 14	n = 9
Vitamin E^a (ng/mL) (range)	3.03 ± 1.75 (0.96–6.50)	1.12 ± 0.74 (0.00–2.10)	0.006*
Glutathione (nmol/mL) (range)	0.48 ± 0.55 (0.00–2.00)	0.45 ± 0.48 (0.00–1.63)	0.90
Iron (μg/mL) (range)	2.28 ± 0.99 (1.28–5.29)	1.89 ± 0.42 (1.43–2.69)	0.27
TBARs^a (nmol/mL) (range)	1.22 ± 0.44 (0.76–2.28)	1.18 ± 0.23 (0.79–1.60)	0.84

^aMean ± standard deviation (S.D.). Abbreviation: KSS Knee society score (Insall et al. 1989; Asif and Choon 2005), TBARs Thiobarbituric acid reactive substances. *significant difference.

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