For differences in HPs with respect to BPD, seven studies examined WBC (18, 20, 25, 26, 29, 30, 34), 9 examined NEU (18, 20, 21, 24–26, 32–34), 2 examined MLR (31, 32), 9 examined lymphocytes (18, 20, 21, 24–26, 32–34), 4 examined monocytes (18, 26, 32, 33), 8 examined HGB (10, 11, 18, 20, 27–29, 34), 4 examined HCT (10, 18, 20), 2 examined RBC (18, 20), 8 examined PLT (18, 20, 24, 25, 29, 32–34), 3 examined PLR (19, 25, 32), 4 examined NLR (21, 25, 31, 32), 3 examined MPV (10, 19, 25), 3 examined PDW (10, 19, 30), 2 examined CRP (30, 32), and 3 examined SIRI (31–33). Here, CRP is linked to bronchopulmonary dysplasia.