Table 6.

Concentrations of PAH metabolites stratified by possible sources of PAH (μg/g Cr)

Variables	2-OH NAP	2-OH FLU	9-OH PHE	1-OH PYR
Passive smoking
Yes	7.38 (6.10, 8.67)	4.14 (3.59, 4.69)	3.36 (2.84, 3.87)	2.02 (1.73, 2.32)
No	7.24 (6.39, 8.08)	4.20 (3.70, 4.70)	3.63 (3.15, 4.11)	2.44 (2.10, 2.77)
p	0.770	0.679	0.792	0.435
Distance from arterial traffic
< 35 m	8.56 (7.05,10.06)	4.44 (3.68, 5.21)	4.01 (3.29, 4.74)	2.53 (2.07, 2.99)
≥ 35 m	6.53 (5.94, 7.12)	4.04 (3.66, 4.42)	3.24 (2.87, 3.61)	2.10 (1.82, 2.37)
p	0.041	0.768	0.095	0.035
Heating type
Collective	7.54 (6.71, 8.38)	4.07 (3.61, 4.53)	3.51 (3.07, 3.96)	2.21 (1.91, 2.51)
Self-provided	6.68 (5.46, 7.90)	4.51 (3.89, 5.14)	3.60 (3.05, 4.14)	2.52 (2.15, 2.90)
P	0.239	0.086	0.366	0.019
Cooking during pregnant period
Yes	7.54 (6.37, 8.71)	3.86 (3.39, 4.33)	3.25 (2.82, 3.68)	2.08 (1.73, 2.42)
No	7.25 (6.38, 8.11)	4.48 (3.91, 5.06)	3.79 (3.23, 4.35)	2.46 (2.12, 2.81)
P	0.526	0.275	0.499	0.222

The table presents the mean and 95% confidence interval. The bold presented a p-value less than 0.05