Table 1 Descriptive statistics

fT level (nmol/L)**

35

0.58

0.45

0.05 to 2.28

20

0.34

0.23

0.05 to 0.95

15

0.91

0.47

0.42 to 2.28

1.54

fE level (nmol/L)

35

0.28

0.18

0.14 to 1.15

20

0.24

0.08

0.14 to 0.45

15

0.34

0.25

0.18 to 1.15

0.54

pT level (nmol/L)

35

0.17

0.06

0.02 to 0.29

20

0.18

0.07

0.02 to 0.29

15

0.16

0.05

0.04 to 0.23

0.31

Gestational age (weeks)

35

16.70

1.47

13 to 21.2

19

16.62

0.90

15 to 18.1

14

16.82

2.04

13 to 21.2

0.13

Child age (months)

35

19.34

2.93

18 to 35

20

19.10

1.33

18 to 23

15

19.67

4.27

18 to 35

0.18

Maternal age (years)

35

36.54

4.74

21 to 46

20

37.75

3.84

33 to 46

15

34.93

5.44

21 to 45

0.60

Parental education (1–5)

35

3.41

0.90

1.5 to 5

20

3.30

0.89

1.5 to 4.5

15

3.57

0.92

2 to 5

0.30

Q-CHAT score**

35

27.03

8.62

10 to 43

20

23.95

8.62

10 to 43

15

31.13

6.94

14 to 40

0.92