Box plot showing (a) platelet and (b) absolute immature platelet count (AIPC).

Platelet count and AIPC on the day of admission (day 1) and at the nadir during the 7 days are shown. Septic patients were classified into four groups according to nadir platelet count during the first 7 days of their ICU stay: severe thrombocytopenia (nadir platelet count ≤40×10³/μL); moderate thrombocytopenia (41–80×10³/μL); mild thrombocytopenia (81–120×10³/μL); and normal-increased platelet counts (>120×10³/μL). Multiple pairwise comparison used the Steel–Dwass test.