The proportion of children with ChEAT scores 22.5 was lower in the experimental than control arm ( boys 11.4 % vs 17.2 % ; girls 18.5 % vs 23.4 % ) [ cluster-adjusted odds ratio ( OR ) , boys : 0.44 ; 95 % confidence interval ( CI ) : 0.21,0.93 ; girls : 0.51 ; 95 % CI : 0.27,0.99 ) .