Table 5.

Comparison of median shower water and pre- and postshower blood THM concentrations for participants in three studies.

	Shower water concentration (μg/L)					Postshower blood concentration (pg/mL)a					Ratio of post- to preshower blood concentration
	Backer et al. 2000	Lynberg et al. 2001		Present study		Backer et al. 2000	Lynberg et al. 2001		Present study		Backer et al. 2000	Lynberg et al. 2001		Present study
THM compoundb		High site	Low site	High site	Low site		High site	Low site	High site	Low site		High site	Low site	High site	Low site
CHCl3	28	85	8	148	28	120	280	57	290	63	4	3	7	2	2
CHBrCl2	6	14	12	33	11	21	38	43	93	28	4	3	4	3	3
CHBr2Cl	1	14	2	6	2	5	41	6	13	6	5	3	3	2	3

n = 11 in Backer et al. (2000); n = 25 at each site of Lynberg et al. (2001); and n = 4 and 3 at the high (NC) and low (TX) sites, respectively, in the present study.

^aApproximately 10 min postshower.

^bCHBr₃ was above, below, or near detection limit in water source at four of five sites and thus was not comparable.