# Time at Risk:

Use this option to specify how to calculate each patients duration in patient years.

| • | Patient Years of Exposure is based on treatment start to end exposure (see logic for how JMP Clinical calculates On Treatment Events for the Event Type option),

| • | Patient Years on Study is based on start to end of study trial dates (RFSTDTC to RFENDTC).

Events are filtered to those that occurred (based on start date) only within that window if time at risk is calculated from Date Variables option.

If the Time at Risk is calculated from specified patient time at risk and event flag variables, then it is assumed that the variables you select appropriately match the selection on this dialog for clear communication of results on the report output.

### To Specify a Time at Risk:

| 8 | Click the appropriate radio button.