Table 4. Glutathione transferase (GST), glutathione peroxidase (GPX), glutathione reductase (GR), and malondialdehyde (MDA) during harvest and non-harvest periods in 28 participants.

Variables	Periods		Paired t test	Multiple analysisa
	Harvest (mean±SDb)	Non-harvest (mean±SD)	p-value	RC (95%CI)c	p-value
GST d(Ug/Hb)	3.38±1.27	3.01±1.31	0.019	0.39(0.16; 0.63)	0.01
GPX e (Ug/Hb)	55.06±11.84	39.48±9.45	0.001	15.31(9.81; 20.82)	<0.001
GR f (Ug/Hb)	3.05±0.97	2.91±1.13	0.401	0.23(−0.08; 0.54)	0.143
MDA g (µM/dL)	7.50±1.42	6.89±1.01	0.088	6.4(−0.26; 13.06)	0.057

^a: multiple analysis adjusted for age, body mass index and smoking;

^b: standard deviation;

^c: regression coefficient and 95% confidence interval;

^d: Glutathione - S- Transferase;

^e: Glutathione Peroxidase;

^f: Glutathione Reductase;

^g: Malondialdehyde.