Table 2.

Anthropometry measurements and prenatal PM_2.5 exposure levels by child sex

Variables	All children		Girls		Boys
	Median	IQR	Median	IQR	Median	IQR
Prenatal PM2.5 level (μg/m3)a	10.7	9.9–11.4	10.8	10.0–11.5	10.6	9.8–11.4
Body Mass Index (BMI)
BMI z-score	0.50	−0.27–1.52	0.61	−0.30–1.48	0.44	−0.26–1.53
Bioimpedance
Fat mass (kg)	3.0	2.1–3.9	2.1	1.1–3.2	3.2	2.8–4.4
Fat free mass (kg)	14	13–16	15	14–16	13	12–15
% body fat (%)	17	13–21	11	6.5–16	19	17–22
Skin fold
Tricep skinfold (mm)	9.1	7.8–11.0	9.8	8.4–12.0	8.4	7.4–10.0
Subscapular skinfold (mm)	6.2	5.2–7.8	6.8	5.6–8.6	5.8	5.0–7.0
Waist and Hip Circumferences
Waist circumference (cm)	52	50–56	53	50–57	52	49–55
Hip circumference (cm)	56	52–59	56	52–60	55	52–59
Waist-to-hip ratio	0.94	0.90–0.98	0.94	0.90–0.98	0.94	0.91–0.98

^aAveraged over pregnancy