front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |review

The first type of control data is the exertion information from a one-hour control period which is defined as at the same hour but on the day before the onset of MI. For example, if a patient had MI at 9pm, May 28, the control period will be at 8-9pm, May 27. The physical exertion information (yes or no) was collected during these 2 time periods.