Initial CD4 and Viral Load Measures. Box and whisker plots of the initial CD4 count and viral load are shown with categorization by testing venue. The boxes represent the interquartile range, the bar within the boxes represents the median value. The whiskers represent the limit for outliers, shown as circles (o), defined as values falling between 1.5 and 3 box lengths from the end of the box. Cases shown as stars (*) are extreme values, defined as greater than 3 box lengths from the end of the box. The horizontal dotted line across represents a CD4 level of 350 (/μL).