1. Figure 4. Subject groups and health status. Percentage limb fluid volume changes for sock addition (blue) and sock removal (orange) shown for all 28 subjects. Groups 1 to 4 were defined based on directions of fluid volume change, as described in text. Numbers to left of graph are add/remove ratios, i.e., quotients of percentage fluid volume change upon sock addition divided by percentage fluid volume change upon sock removal. Table to right of bar graph indicates subjects in good health (g); presence of health condition: a = arterial disease or peripheral vascular disease, v = venous insufficiency, h = high blood pressure, d = diabetic, z = other condition (z1 = heart arrhythmia, z2 = lifetime antibiotics because of residual limb infection, z3 = renal failure and dialysis, z4 = congestive heart failure). A "–" indicates that ambulatory strain-gauge plethysmography testing was not conducted. People who were overweight (25 < body mass index ≤ 30) (o) and obese (body mass index > 30) (O) are indicated in "O" column, and smokers (s) are indicated in "S" column. Reasons for amputation (R) include trauma (t), vascular (arterial) disease (vd), spina bifida (b), Larsson syndrome (L), and cancer (c). Sanders JE, Harrison DS, Allyn KJ, Myers TR, Ciol MA, Tsai EC. How do sock ply changes affect residual-limb fluid volume in people with transtibial amputation? J Rehabil Res Dev. 2012;49(2):241–56.http://dx.doi.org/10.1682/JRRD.2011.02.0022