Table 1 Sample characteristics of treatment delivery

Infant female sex, no. (%)

27

10 (37%)

30

12 (40%)

18

7 (39%)

Infant birth weight, mean grammes, (SD)

27

1355 (405)

30

1365 (401)

18

1314 (358)

Infant GA at birth, mean weeks, (SD)

27

30.1(2.5)

30

30.0 (2.6)

18

29.6 (2.4)

Mother age, mean years (SD)

26

31.8 (4.0)

29

32.0 (5.2)

17

32.3 (3.9)

Mother education, mean years (SD)

27

15.8 (3.8)

30

16.1 (3.1)

18

16.4 (2.7)

Mother usual work situation, no. (%)

27

-

30

-

18

-

 Full-time- or self-employed

19 (70%)

21 (70%)

12 (67%)

 Other^a

8 (30%)

9 (30%)

6 (33%)

Mother civil status, no. (%)

26

-

30

-

18

-

 Married

19 (73%)

20 (67%)

13 (72%)

 Living together but not married

7 (27%)

9 (30%)

5 (28%)

 Others

-

1 (3%)

-

Father age, mean years (SD)

27

34.5 (4.4)

30

34.2 (5.3)

18

34.2 (5.0)

Father education, mean years (SD)

26

15.1 (3.6)

29

15.0 (3.4)

17

15.6 (3.2)

Father usual work situation, no. (%)

27

-

30

-

18

-

 Full-time- or self-employed

26 (96%)

29 (97%)

17 (94%)

 Other^a

1 (4%)

1 (3%)

1 (6%)