Table 1. Comparison of tetracycline residue levels in organic and commercial chicken eggs

Type of egg	n	MRL1) in ng/g	Mean±SD (ng/g)	p-value	Rank-biserial correlation	95% CI
Organic	114	400	18.16±82.52)	0.0043)	−0.228	[−0.364, −0.081]
Commercial	114	400	1.10±37.2

MRL, maximum residue limit.
Two samples (1.75%) were found to exceed the MRL.
Significant difference in total tetracycline resides between liver and meat at p<0.05.