CD19 and hip fracture: A significant association was observed between GDS scores and frequency of peripheral CD19+CD24hiCD38hi B cells in hip fracture patients, β = −0.38, p = 0.01, ΔR2 = 0.15, such that hip fracture patients with greater depressive symptoms (GDS score) had lower frequency of CD19+CD24hiCD38hi B cells (Fig. 3c).