Fig 1.

Determination of the etiologically relevant induction time of wind speed on the occurrence of sickle cell-related painful episodes. Figure 1 shows the results of an analysis to determine the most etiologically relevant induction time. Since misclassification of exposure should bias the measure of association (odds ratio) toward the null, the interval that maximizes the odds ratio should reflect the appropriate induction time. The interval 13 to 16 h before the start of the painful was most strongly associated with the onset of pain and therefore was the most likely induction time.