Table 4.

Definition of the outcome variable.

This is a hypothetical example of the definition of the outcome variable over 15 days of measurement. The patient experiences an exacerbation at day 9 and day 15. The outcome variable corresponding to a severe asthma exacerbation within 2 days is displayed on the 2-day window row. For example, at day 8 an exacerbation will occur within 2 days—it occurs the next day—and day 8 is therefore part of the 2-day window outcome. Similarly, the outcome variable definitions corresponding to exacerbations within 4 and 8 days are displayed on the 4- and 8-day window rows.