All are true of standardized moality ratio except:

Expressed as rate per year Standardized moality ratio (SMR) = Expected death/ Observed deaths x 100 If the ratio had value greater than 100, the risk of moality rises. * SMR permit adjustment for age and it is of value if the event of interest is occurrence of disease rather than death. * Other standardization techniques * Life table * Regression techniques * Multivariate analysis