This field is calculated from date of birth (dob) and the date of the psychiatric census (31 March every year). It is only calculated for psychiatric census records; if the episode type is not for a formally detained patient (epitype is not 4) or one that was admitted more than one year previously, censage is null. The maximum permitted value is 120 years.

3n = Age in years from 1 to 119 on the date of the annual psychiatric census

120 = 120 years or more on the date of the annual psychiatric census

null = Not applicable (epitype is not 4) / not known