Table 5.

Estimated BMDs and BMDLs for BTX components based on their hematological effects.

BTX Component	Model Name	Chi-Squared	p for Goodness-of-Fit Tests	AIC	BMD (mg/m3 × year)	BMDL (mg/m3 × year)
Benzene	Multistage a	6.017	0.421	777.588	2.138	1.559
Toluene	Dichotomous Hill b	4.322	0.364	704.276	1.449	1.325
Xylene	Probit c	5.669	0.461	741.547	2.937	2.312

Note: Abbreviations: AIC, Akaike’s Information Criterion; BMD, benchmark dose; BMDL, lower confidence limit of BMD. ^a The Multistage dose–response model was represented as P[X] = background + (1 − background) × [1 − exp(−slope₁ × X₁ − slope₂ × X₂−…)]. ^b The Dichotomous Hill dose–response model was defined by P[X] = background + (v − v × background)/[1 + exp(−intercept − slope × Log(X))], where v is the maximum probability of response predicted by the model. ^c The Probit dose–response model was represented as P[X] = CumNorm(intercept + slope × X).