Table 2.

Maternal characteristics according to early pregnancy levels of perfluoroalkyl acids in 1,507 mothers from the Aarhus Birth Cohort, 2008–2013.

PFAA	Age (years) [median (IQR)]	Prepregnancy BMI (kg/m2) [median (IQR)]	Education (%)
			1 (n = 42)	2 (n = 439)	3 (n = 580)	4 (n = 446)
PFHxS
Q1	29 (27–31)	22 (20–25)	50	27	27	19
Q2	29 (27–31)	22 (21–25)	19	24	26	25
Q3	30 (27–32)	22 (21–25)	21	27	23	25
Q4	31 (29–33)	22 (20–25)	10	23	24	31
PFHpS
Q1	29 (27–32)	22 (20–24)	48	23	26	24
Q2	29 (27–32)	22 (20–24)	14	28	25	26
Q3	29 (27–32)	22 (20–25)	21	24	26	22
Q4	30 (28–33)	22 (21–25)	17	24	22	28
PFOS
Q1	29 (27–32)	22 (20–25)	45	25	27	22
Q2	29 (27–32)	22 (20–25)	19	25	25	24
Q3	29 (27–32)	22 (20–24)	22	27	23	29
Q4	30 (28–32)	22 (21–25)	14	23	25	25
PFOA
Q1	29 (27–32)	22 (21–26)	43	23	27	23
Q2	29 (27–32)	22 (20–24)	28	25	26	26
Q3	29 (27–31)	22 (20–25)	10	27	23	25
Q4	30 (28–32)	22 (21–25)	19	25	24	26
PFNA
Q1	29 (27–32)	22 (20–25)	48	26	25	21
Q2	30 (28–32)	22 (21–25)	17	26	25	27
Q3	30 (27–32)	22 (20–24)	10	24	24	27
Q4	30 (28–32)	22 (21–25)	26	24	26	24
PFDA
Q1	29 (27–32)	22 (20–25)	38	27	27	20
Q2	29 (27–31)	22 (21–25)	19	25	26	24
Q3	30 (27–33)	22 (20–25)	10	25	23	29
Q4	30 (28–32)	22 (20–24)	33	23	24	28
PFUnA
Q1	29 (27–32)	22 (21–26)	48	30	27	18
Q2	29 (27–32)	22 (20–25)	19	25	26	22
Q3	30 (27–32)	22 (20–25)	17	23	23	31
Q4	30 (28–32)	22 (20–24)	17	22	24	29
Abbreviations: IQR, interquartile range; PFAA, perfluoroalkyl acid; Q, quartile. For specific PFAA abbreviations see Table 1. Definitions of highest completed maternal education: 1. Municipal primary and lower secondary school; 2. upper secondary school, or 1–2 years of vocational training; 3. additional 3–4 years of education, e.g., Bachelor’s degree; 4. > 4 additional years of education, e.g., Master’s degree.