OS patients on average had 6.3 g/L lower Hb levels compared to controls (p = 0.001), and 3.7 g/L lower Hb than patients with osteoporosis/penia (p < 0.026). Sarcopenia and OS (but not osteoporosis alone) are associated with anemia. The gene discussed is GSTM1; the disease is osteoporosis.