Table 2.

Correlation of Nicotine and Cotinine in Plasma, Saliva, and Urine of SLT Users

	Saliva nicotine		Saliva cotinine		Urine nicotine		Urine cotinine
	r	P	r	P	r	P	r	P
Plasma nicotine	-0.42	0.16			0.38	0.22
Plasma cotinine			-0.041	0.89			0.046	0.88

r, Correlation coefficient; P ≤0.05.