RETRACTED ARTICLE: Serum sphingosine-1-phosphate levels and Sphingosine-1-Phosphate gene polymorphisms in acute respiratory distress syndrome: a multicenter prospective study

Table 2 Characteristics of study groups

Variables	Control (n = 100)	ARDS (n = 121)	P value
Age, years	51.0 (39.75–65.75)	61.0 (43.5–69.0)	n.s.
Male/Female	66/34 (66.0/34.0)	84/37 (69.4/30.6)	n.s.
Ethnicity			n.s.
Hans	100 (100)	121 (100)
Serum-S1P, nmol/L	930.5 (733.2–1153.4)	303.0 (221.3–418.5)	< 0.001
RBC count, × 10¹²/L	4.5 (3.89–5.063)	2.8 (2.475–3.1)	< 0.001
Platelet count, × 10⁹/L	199.5 (150.3–253.8)	174 (92.5–259)	0.025
Serum albumin, g/L	40 (36–44.28)	29.4 (27.3–31.95)	< 0.001
HDL, mmol/L	1.40 (1.04–2.13)	0.57 (0.36–0.89)	< 0.001

Continuous variables are presented as median (interquartile range); categorical variables are presented as No. (%)
ARDS Acute respiratory distress syndrome, n.s. non-significant, S1P sphingosine-1-phosphate, RBC red blood cell, HDL high-density lipoprotein

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