# Duration Time Windows

Use this text field to specify a list of bracketed time values that indicate the various periods and durations of exposure. The analysis then incorporates only those patients whose exposure durations fall into these s. Data occurring outside of the s are not included. The resulting report includes the number of patients whose total exposure included these time periods.

Each must be expressed in the form [s 1,e 1] [s 2,e 2] ... where s x is a numeric start time and e x is a numeric end time. The time unit can be days or weeks as specified in the Time Scale parameter. Each time point is relative to the reference start date for each subject.

If a time consists of a single time unit, you can specify a single numeric value within brackets for that .

Leave this field blank when patients were exposed for the entire duration of the trial as one large time .

### To Specify a Set of Times:

| 8 | Select either Days or Weeks as the Duration Time Scale.

| 8 | Select Use Duration Time s List as the Duration Time Window Method.

| 8 | Enter the start and end time for each , enclosed in square brackets ([]), within the text field.

For example, if you desire to have three time s corresponding to days 2-5, 6-10, and 11-20:

| 8 | Type [2,5] [6,10] [11,20] in the text field, as shown below: