Use the following time scale for exposure time

Choose the time scale for exposure.

Common time scales include:

Time Scale	Expressed in Days
Weeks	7
Months	30.4375
Years	365.25

Exposure calculations differ depending on whether each subject experienced the event:

Does the subject experience the event?	Start	End
No	reference start date (RFSTDTC)	reference end date (RFENDTC)
Yes	reference start date (RFSTDTC)	the earliest event start date (AESTDTC)

To Select the Time Scale for Exposure:

Specify Log Linear for Fit model type.

Click the radio button corresponding to your choice.