. 2011 Jun 10;119(9):1239–1246. doi: 10.1289/ehp.1003394

Table 1.

Estimated model parameters from the full model for both the single-chemical and mixture data fitted simultaneously with mean squared error = 0.11.

Chemical abbreviation	Full model							Additivity model
Chemical abbreviation	Chemical	Parameter	Estimate	SE	p-Value	Estimate	SE
				α_1,4,5		119.9		0.71	< 0.001	119.9	0.79
				α_6,10		113.7		1.06	< 0.001	113.7	1.16
				α_7,11,mix		126.9		0.95	< 0.001	127.7	1.27
β-Cyfluthrin		BCF		β₁ (BCF)		0.40		0.08	< 0.001	0.40	0.08
Bifenthrin		BIF		β₂ (BIF)		0				0
Cypermethrin		CPM		β₃ (CPM)		0				0
Deltamethrin		DEL		β₄ (DEL)		0.65		0.10	< 0.001	0.65	0.10
Esfenvalerate		ESF		β₅ (ESF)		0.32		0.06	< 0.001	0.32	0.06
Fenpropathrin		FEN		β₆ (FEN)		0.19		0.06	0.001	0.19	0.05
λ-Cyhalothrin		LCH		β₇ (LCH)		0.39		0.06	< 0.001	0.38	0.07
Permethrin		PER		β₈ (PER)		0				0
Resmethrin		RES		β₉ (RES)		0				0
S-Bioallethrin		S-BIO		β₁₀ (S-BIO)		0.43		0.13	< 0.001	0.46	0.14
Tefluthrin		TEF		β₁₁ (TEF)		0.23		0.04	< 0.001	0.22	0.03
Mixture		Mixture		θ_mix		0.28		0.03	< 0.001
The full model is given in Supplemental Material, Equation 2 (http://dx.doi.org/10.1289/ehp.1003394). There is no significant departure from additivity using a likelihood ratio test [F = 0.55; df = (1, 428); p = 0.459].