Researchers investigated the association betweenChlamydia pneumoniaeinfection and mortality in a cohort of 227 end-stage renal disease (ESRD) patients followed up for 40 months. Patients were divided into two groups according to the presence/absence of antibodies forC.pneumoniae: 138 patients were classified as seronegative and the remaining 89 patients as seropositive. Number of deaths/survivors in the study population according to the presence/absence ofC. pneumoniaeinfection:

What is the crude risk ratio (to 2 decimal places) for mortality among those positive forC. pneumoniaeinfections compared to those who were negative?