Study group background characteristics. حسب Zicheng Hu (3825313)

"…The dashed horizontal lines in <b>Fig 1K</b>–<b>1O</b> indicate the mean +2 SD of the uninfected, seronegative (<b><i>HIV-</i></b>) control group in the measured variable as a rough estimate of their upper normal limit and as a visual guide to compare groups; this convention is also used in the Olink CSF protein measurement figures showing the group profiles in subsequent figures. …"