. Author manuscript; available in PMC: 2008 Oct 8.

Published in final edited form as: J Anal Toxicol. 2004;28(8):667–673. doi: 10.1093/jat/28.8.667

Table II.

Effect of Duration of Wear of Sweat Patches on Analyte Concentrations^†

		Model #1			Model #2
Analyte	Variable	Patch duration	Parameter	Standard error	Patch duration	Parameter	Standard error
Cocaine
	b₀	1 day	3.858	.498^***	1 week	5.436	.568^***
	b₁	1 day random	−0.078	.183	1 day	−1.601	.235^***
	b₂	3 days	1.108	.183^***	1 day random	−1.656	.334^***
	b₃	1 week	1.574	.226^***	3 days	−0.469	.198^*
	b₄	2 weeks	1.854	.403^***	2 weeks	0.116	.301

Ecgonine methyl ester
	b₀	1 day	2.099	.339^***	1 week	3.463	.445^***
	b₁	1 day random	−0.028	.153	1 day	−1.366	.196^***
	b₂	3 days	0.930	.149^***	1 day random	−1.392	.257^***
	b₃	1 week	1.362	.180^***	3 days	−0.440	.166^**
	b₄	2 weeks	1.807	.331^***	2 weeks	0.284	.252

Benzoylecgonine
	b₀	1 day	1.954	.350^***	1 week	3.702	.482^***
	b₁	1 day random	−0.103	.163	1 day	−1.757	.223^***
	b₂	3 days	1.289	.160^***	1 day random	−1.850	.272^***
	b₃	1 week	1.734	.242^***	3 days	−0.478	.179^**
	b₄	2 weeks	3.175	.352^***	2 weeks	1.300	.271^***

^†

Note: Significance test of b₀ term evaluates whether that coded group (the reference group) is significantly different from zero. Significance tests of b₁–b₄ evaluate whether the difference between the mean of that group and the reference group is significantly different.

P < 0.05,

^**

P < 0.01,

^***

P < 0.001