989345.fig.001
Figure 1: The effect of sleep deprivation on immediate code substitution recall (% correct) in persons classified by JNC-7 criteria of prehypertensive or normotensive. The time by Risk Group interaction was significant [multivariate F(3, 41) , , ]. Fisher’s LSD indicates a significant drop in performance at 5:30 AM, in prehypertensives ( ).