Table 6.

Summary of the Bayesian/OBSM comparison study.

Analyte	Comparison #	Number of EGs	Metric	Time period	Description	GSD derivationa	Slope	Intercept	R 2
Benzene	1a	93	AM	All	All data	OBSM	1.44	0.21	0.76
Benzene	1b	66	AM	All	Non-censored, N > 1	OBSM	1.49	0.06	0.90
Benzene	1c	27	AM	All	Non-censored, N = 1	OBSM	2.05	0.26	0.74
Benzene	2a	70	AM	All	All land	OBSM	1.47	0.18	0.78
Benzene	2b	52	AM	All	All land, non-censored, N > 1	OBSM	1.52	0.04	0.90
Benzene	2c	18	AM	All	All land, non-censored, N = 1	OBSM	1.96	0.32	0.77
Benzene	3a	23	AM	All	All water	OBSM	1.30	0.35	0.67
Benzene	3b	14	AM	All	All water, non-censored, N > 1	OBSM	1.32	0.22	0.91
Benzene	3c	9	AM	All	All water, non-censored, N = 1	OBSM	2.41	0.07	0.70
Benzene	4a	93	AM	All	All data	Bayesian	1.44	0.21	0.76
Benzene	4b	66	AM	All	Non-censored, N > 1	Bayesian	1.62	0.03	0.90
Benzene	4c	27	AM	All	Non-censored, N = 1	Bayesian	1.89	0.35	0.64
Benzene	5a	44	AM	TP1b and TP2b	All data	OBSM	1.35	0.27	0.72
Benzene	5b	49	AM	TP3-6	All data	OBSM	1.54	0.17	0.79
Benzene	6a	30	AM	TP1b and TP2	Non-censored, N > 1	OBSM	1.41	0.08	0.91
Benzene	6b	36	AM	TP3-6	Non-censored, N > 1	OBSM	1.60	0.03	0.90
Benzene	7a	93	GM	All	All data	OBSM	1.24	0.04	0.71
Benzene	7b	66	GM	All	Non-censored, N > 1	OBSM	1.29	0.12	0.82
Benzene	8a	93	95th %-ile	All	All data	OBSM	1.30	0.74	0.80
Benzene	8b	66	95th %-ile	All	Non-censored, N > 1	OBSM	1.32	0.28	0.92
Toluene	9a	20	AM	All	All data	OBSM	1.37	0.33	0.49
Toluene	9b	13	AM	All	Non-censored, N > 1	OBSM	1.81	−0.18	0.50
Toluene	9c	20	AM	All	All data	Bayesian	1.29	0.38	0.47

95th %-ile, 95th percentile; AM, arithmetic mean; GM, geometric mean; GSDs, geometric standard deviations; OBSM, order-based statistical method.

^a OBSM indicates that a GSD of 6.0 was used for water EGs, and 8.0 was used for land EGs. Bayesian indicates that the GSD generated by the Bayesian analysis was used in the OBSM calculation.

^b TP1a was not included because there were no EGs that met the study criteria.