Table 4 Association between cord blood concentrations of PFASs and risk for childhood AD (n = 687)

 Continuous^a

1.17 (0.85–1.62)

1.23 (0.85–1.76)

0.33

 Q1 (< 1.81)^b

1

1

0.26

 Q2 (1.81–2.48)

1.06 (0.64–1.74)

0.93 (0.56–1.58)

 Q3 (2.48–3.24)

1.03 (0.62–1.69)

1.00 (0.59–1.70)

 Q4 (≥ 3.24)

1.34 (0.83–2.18)

1.31 (0.78–2.20)

 p for trend^c

0.27

0.27

 Continuous^a

1.44 (1.02–2.03)

1.35 (0.93–1.97)

0.17

 Q1 (< 4.94)^b

1

1

0.14

 Q2 (4.94–6.98)

1.47 (0.89–2.44)

1.48 (0.87–2.52)

 Q3 (6.98–9.55)

1.18 (0.70–1.98)

1.16 (0.67–2.00)

 Q4 (≥ 9.55)

1.84 (1.12–3.02)

1.74 (1.02–2.95)

 p for trend^c

0.04

0.1

 Continuous^a

1.49 (0.95–2.32)

1.53 (0.94–2.47)

0.46

 Q1 (< 0.50)^b

1

1

0.33

 Q2 (0.50–0.64)

1.29 (0.78–2.13)

1.15 (0.67–1.97)

 Q3 (0.64–0.83)

1.29 (0.78–2.13)

1.20 (0.71–2.05)

 Q4 (≥ 0.83)

1.49 (0.91–2.45)

1.47 (0.87–2.50)

 p for trend^c

0.13

0.15

 Continuous^a

1.18 (0.93–1.50)

1.22 (0.94–1.58)

0.65

 Q1 (< 0.23)^b

1

1

0.68

 Q2 (0.23–0.36)

0.87 (0.52–1.44)

0.94 (0.55–1.60)

 Q3 (0.36–0.54)

1.16 (0.71–1.90)

1.15 (0.68–1.95)

 Q4 (≥ 0.54)

1.42 (0.88–2.30)

1.58 (0.94–2.65)

 p for trend^c

0.08

0.06

 Continuous^a

1.18 (0.86–1.63)

1.24 (0.88–1.75)

0.67

 Q1 (< 0.29)^b

1

1

0.83

 Q2 (0.29–0.40)

0.99 (0.60–1.64)

1.01 (0.59–1.71)

 Q3 (0.40–0.53)

1.13 (0.69–1.84)

1.13 (0.67–1.90)

 Q4 (≥ 0.53)

1.31 (0.80–2.12)

1.36 (0.81–2.28)

 p for trend^c

0.23

0.22

 Continuous^a

0.96 (0.70–1.30)

1.00 (0.72–1.39)

0.28

 Q1 (≤ 0.069)^b

1

1

0.76

 Q2 (0.069–0.094)

1.72 (1.05–2.80)

1.83 (1.09–3.08)

 Q3 (0.094–0.125)

1.21 (0.73–2.01)

1.37 (0.80–2.34)

 Q4 (≥ 0.125)

1.17 (0.71–1.95)

1.18 (0.68–2.04)

 p for trend^c

0.93

0.87

 Continuous^a

1.31 (0.80–2.13)

1.08 (0.62–1.85)

0.43

 Q1 (≤ 0.13)^b

1

1

0.05

 Q2 (0.13–0.16)

1.21 (0.73–1.99)

1.25 (0.74–2.12)

 Q3 (0.16–0.20)

1.32 (0.81–2.17)

1.15 (0.68–1.94)

 Q4 (≥ 0.20)

1.36 (0.83–2.23)

1.14 (0.67–1.94)

 p for trend^c

0.2

0.73

 Continuous^a

1.20 (0.87–1.66)

1.22 (0.87–1.72)

0.83

 Q1 (≤ 0.037)^b

1

1

0.33

 Q2 (0.037–0.047)

1.13 (0.69–1.86)

1.28 (0.75–2.17)

 Q3 (0.047–0.062)

1.21 (0.74–1.97)

1.18 (0.70–2.00)

 Q4 (≥ 0.062)

1.19 (0.73–1.95)

1.15 (0.68–1.95)

 p for trend^c

0.46

0.70