Table 1 Socio-demographic characteristics of sample, comparing intervention group with control group

Children’s age (years), n (%) ^a

.94

  0–

54 (37.2)

49 (37.4)

  1–

46 (31.7)

40 (30.5)

  2–

45 (31.0)

42 (32.1)

Fathers’ age (years), n (%) ^a

.35

  < 25

8 (5.5)

4 (3.1)

  25–30

49 (32.4)

38 (29.0)

  30–35

57 (38.6)

56 (42.7)

  > 35

35 (23.5)

34 (25.2)

Fathers’ education, n (%) ^a

.09

  Senior high school or below

14 (9.7)

14 (10.7)

  College

36 (24.8)

17 (13.0)

  Undergraduate or above

95 (65.5)

100 (76.3)

Fathers’ occupation, n (%) ^b

.12

  Employee of state-owned enterprises and public institutions

43 (29.7)

47 (35.9)

  Employee of foreign-funded, private and enterprises

67 (46.2)

65 (49.6)

  Other (farmers, soldiers, freelancers)

35 (24.1)

19 (14.5)

  Unemployed

0 (0)

0 (0)

Mothers’ age (years), n (%) ^a

.05

  < 25

15 (10.3)

9 (6.9)

  25–30

68 (46.9)

49 (37.4)

  30–35

41 (28.3)

51 (38.9)

  > 35

21 (14.5)

22 (16.8)

Mothers’ education, n (%) ^a

.18

  Senior high school or below

19 (13.1)

16 (12.2)

  College

33 (22.8)

20 (15.3)

  Undergraduate or above

93 (64.1)

95 (72.5)

Mothers’ occupation, n (%) ^b

.17

  Employee of state-owned enterprises and public institutions

34 (23.4)

36 (27.5)

  Employee of foreign-funded, private and enterprises

54 (37.2)

60 (45.8)

  Other (farmers, soldiers, freelancers)

42 (29.0)

27 (20.6)

  Unemployed

15 (10.3)

69 (25.0)

  Score of knowledge, mean (95% CI) ^c

4.41 (4.19–4.63)

4.50 (4.26–4.75)

.56