highly significantp-values < 0,001
When testing the differences between the age groups with chi 2 for trend, these are highly significant, both for the total group of infections and for the serious infections, with p-values < 0,001.
When testing the differences between the age groups with chi 2 for trend, these are highly significant, both for the total group of infections and for the serious infections, with p-values < 0,001.
A linear regression analysis shows that there is a marginally significant decline in yearly incidence of 58 acute infections per 1000 children per year from 1998 to 2002 (p = 0.05).