Table Varicella and Vaccination Calculate the cumulative inc

Table. Varicella and Vaccination

Calculate the cumulative incidence rates for the exposed, unexposed, and total populations.

Calculate and interpret the Rate Ratio.

Solution

Cumulative incidence for the exposed group =15/115 =.1304 =13.04%

Cumulative incidence of the unexposed group =18/27 =.6666 =66.66%

Cunulative inicdence of the total population =33/142 =.2323 =23.23%

Risk Ratio = (CI_e) / (CI_u)

where CI_e is the cumulative incidence in the \'exposed\' group and CI_u is the cumulative incidence in the \'unexposed\' group.

Thus the risk ratio =.1304/.666 =.1956

As the risk ratio is less than 1 it suggests a reduced risk in the exposed group