Table 5 Hazard ratios (95% CI) and p-values between treatment and non-treatment in brushing and non-brushing schools and between brushing and non-brushing schools

Brushing schools

SDF treated (n=288)

versus non-treated (n=127)

1.16 (0.51-2.63) p=0.72

Sealants (n=301)

versus non-treated (n=127)

0.12 (0.02-0.61) p<0.01

Non-brushing schools

SDF treated (n=418)

versus non-treated (n=544)

0.71 (0.45-1.11) p=0.12

Sealants (n=467)

versus non-treated (n=544)

0.33 (0.20-0.54) p<0.001

Brushing

versus non-brushing

Non-treated brushing (n=127)

versus non-treated non-brushing (n=544)

0.43 (0.21-0.87) p<0.02

SDF treated brushing (n=288)

versus SDF treated non-brushing (n=418)

0.70 (0.38-1.27) p=0.23

Sealants brushing (n=298)

versus sealants non-brushing (n=438)

0.15 (0.03-0.72) p<0.02