Table 6.

Regression analysis of predicting natural log-transformed serum concentrations of PFCs for children in California, USA (2008–2009).

N^b	PFOS		PFOA		PFNA		PFDA		PFHxS		Me-PFOSA-AcOH
N^b	52		58		53		63		62		59
Effect	Slope (SE)	p	Slope (SE)	p	Slope (SE)	p	Slope (SE)	p	Slope (SE)	p	Slope (SE)	p
Intercept	1.31 (0.18)	<.01	1.18 (0.14)	<.01	0.07 (0.16)	0.67	−0.99 (0.15)	<.01	−0.28 (0.25)	0.28	−1.79 (0.21)	<.01
Child’s age (year)	0.04 (0.04)	0.27			0.09 (0.04)	0.04
HVS3 dust concentration (ng/g)	0.0001 (0.00006)	0.05			0.0008 (0.0002)	<.01
Frequency of wearing waterproof clothes (time/week)	0.01 (0.003)	<.01			0.01 (0.004)	0.01
Frequency of having pre-packaged candy or bakery items (ref=never)
<1 Time/week							−0.02 (0.24)	0.94
≥1 Time/week							−0.41 (0.18)	0.03
Frequency of eating (time/week)
Canned meat entrées							−0.31 (0.16)	0.06
Canned fish											0.66 (0.22)	<.01
Fresh tuna and white fish	0.08 (0.06)	0.19			−0.15 (0.07)	0.03
Hotdogs	0.22 (0.08)	0.01									0.39 (0.17)	0.03
Nuggets									0.11 (0.09)	0.19
French fries					−0.17 (0.08)	0.05
Crackers other than graham crackers	−0.03 (0.01)	0.06
Chips			0.07 (0.03)	0.01
Microwave popcorn											0.40 (0.22)	0.08
Breastfeeding (ref=none to 1.5 months)
Breastfed for 3–6 months	−0.08 (0.20)	0.71	0.08 (0.18)	0.65					0.13 (0.32)	0.69
Breastfed for 6–12 months	0.11 (0.15)	0.47	0.23 (0.15)	0.13					0.61 (0.27)	0.03
Breastfed for > 12 months	0.36 (0.16)	0.03	0.47 (0.16)	0.01					0.63 (0.28)	0.03
R-square	0.51		0.21		0.46		0.13		0.14		0.25

Slope (SE): estimated regression coefficient (standard error).

The serum concentrations of PFCs were natural log-transformed.

The total sample size for the child population is 68. The actual number of observations used is influenced by the predictors selected, which varied by compound.