Table 3 Net caries increment and caries prevented fraction of 2–3-year-old children and their older siblings in control and intervention group (N = 478)

 dft

0.94 (1.6)

1.18 (1.8)

0.24(0.8)

1.15 (1.6)

1.90 (1.9)

0.75 (1.2)

< 0.001

68.0

 dt

0.76 (1.2)

0.34 (0.8)

−0.42 (0.9)

0.91 (1.4)

0.87 (1.4)

0.04 (1.2)

< 0.001

 ft

0.18 (0.6)

0.84 (1.3)

0.66 (1.1)

0.24(0.8)

1.04 (1.2)

0.79 (1.3)

0.021

 dft

2.45 (2.1)

2.60 (3.0)

0.20 (0.7)

2.08 (2.3)

2.63 (2.4)

0.55 (0.9)

< 0.001

63.6

 dt

2.07 (2.6)

0.97 (1.7)

−1.17 (1.8)

1.57 (1.8)

1.29 (1.5)

− 0.28 (1.3)

< 0.001

 ft

0.33 (0.9)

1.70 (2.0)

1.37 (1.7)

0.51 (1.1)

1.34 (1.5)

0.83 (1.2)

< 0.001