Figure 3.

Critical closing pressure under activated and hypotonic conditions. A boxplot of the critical closing pressures (Pcrit) under activated and hypotonic conditions for the different races is shown. The box represents the interquartile range that contains 50% of the val ues. The line across the box indicates the median. The whiskers extend from the box to the highest and lowest values, excluding outliers (O), which are defined as cases with values between 1.5 and 3 box lengths from either end of the box. No significant differences were observed between African Americans and Caucasians. CC, Caucasian; AA, African American; act, activated technique; hyp, hypotonic technique.