Table 1 Characteristics of intervention and control groups (n = 112)

Age (years)

 6–9

23 (41.1)

19 (33.9)

0.609 (0.434)

 9–12

33 (58.9)

37 (66.1)

Sex

 Boy

26

29

0.321 (0.570)

 Girl

30

27

Mother’s age

 < 35

38 (67.9)

34 (60.7)

0.622 (0.430)

 ≥ 35

18 (32.1)

22 (39.3)

Father’s age

 < 35

31 (55.4)

26 (46.4)

0.893 (0.344)

 ≥ 35

25 (44.6)

30 (53.6)

Mother’s education

 University

22 (39.3)

27 (48.2)

0.907 (0.340)

 High school or lower

34 (60.7)

29 (51.8)

Father’s education

 University

35 (62.5)

42 (75.0)

2.036 (0.153)

 High school or lower

21 (37.5)

14 (25.0)

Mother’s job

 Employee

7 (12.5)

11 (19.6)

1.059 (0.303)

 Housekeeper

49 (87.5)

45 (80.4)

Father’s job

 Employee

47 (83.9)

53 (94.6)

3.36 (0.066)

F value = 0.123^*

 Self-employed

9 (16.1)

3 (5.4)

Health insurance with dental coverage

 Yes

43 (76.8)

49 (87.5)

2.191 (0.138)

 No

13 (23.2)

7 (12.5)

Family income

 Poor

8 (14.3)

11 (19.6)

1.992 (0.369)

 Moderate

32 (57.1)

35 (62.5)

 Good

16 (28.6)

10 (17.9)