In addition, ARDS/ALI patients had higher levels of KL‐6 (SMD: 3.36; P < 0.001), MPO (SMD: 2.58; P < 0.001), procalcitonin (PCT) (SMD: 0.41; P = 0.038), receptor for advanced glycation end products (RAGE) (SMD: 1.64; P = 0.031), sE-selectin (SMD: 0.55; P = 0.011), TF (SMD: 3.55; P < 0.001), and TNF receptor‐2 (SMD: 3.82; P < 0.001) than unaffected individuals. Here, MPO is linked to acute respiratory distress syndrome.