Table 5.

Multiple linear regressions between serum CC16 concentration (μg/L) in relation to a unit increase in indicators of DBP exposure and energy expenditure.

Model	Variables	β (95% CI)	p-Value	R2	n
1	CHClBr2, exhaled breath (μg/m3)	1.68 (0.93 to 2.43)	< 0.001	0.45	46
	Energy expenditure (kcal)	0.69 (0.09 to 1.28)	0.024
2	CHClBr2, exhaled breath (μg/m3)	1.49 (0.65 to 2.33)	0.001	0.46	46
	Energy expenditure (kcal)	0.68 (0.08 to 1.27)	0.027
	Free chlorine (mg/L)	0.33 (−0.35 to 1.01)	0.336
3	CHCl2Br, exhaled breath (μg/m3)	0.45 (0.01 to 0.89)	0.047	0.26	46
	Energy expenditure (kcal)	0.97 (0.30 to 1.64)	0.005
4	CHCl2Br, exhaled breath (μg/m3)	0.35 (−0.09 to 0.78)	0.117	0.34	46
	Energy expenditure (kcal)	0.87 (0.22 to 1.51)	0.010
	Free chlorine (mg/L)	0.77 (0.08 to 1.46)	0.030
5	CHBr3, exhaled breath (μg/m3)	0.98 (0.31 to 1.65)	0.005	0.33	46
	Energy expenditure (kcal)	0.66 (−0.03 to 1.35)	0.060
6	CHBr3, exhaled breath (μg/m3)	0.82 (0.16 to 1.48)	0.016	0.39	46
	Energy expenditure (kcal)	0.61 (−0.05 to 1.28)	0.070
	Free chlorine (mg/L)	0.69 (0.03 to 1.36)	0.042
7	TTHMs, exhaled breath (μg/m3)	0.46 (−0.10 to 1.02)	0.105	0.24	46
	Energy expenditure (kcal)	0.97 (0.29 to 1.65)	0.006
8	TTHMs, exhaled breath (μg/m3)	0.30 (−0.25 to 0.86)	0.274	0.32	46
	Energy expenditure (kcal)	0.88 (0.22 to 1.53)	0.010
	Free chlorine (mg/L)	0.79 (0.08 to 1.49)	0.030
9	Free chlorine (mg/L)	0.85 (0.16 to 1.54)	0.017	0.28	47
	Energy expenditure (kcal)	0.90 (0.25 to 1.56)	0.008

Abbreviations: CHClBr₂, dibromochloromethane; CHCl₂Br, bromodichloromethane; CHBr₃, bromoform; CI, confidence interval; TTHMs, total THMs. No other variables were included in the models.