Early intravenous unfractionated heparin and outcome in acute lung injury and acute respiratory distress syndrome – a retrospective propensity matched cohort study

Table 4 Mortality over 28 days in patients with acute lung injury stratified for aPTT

	Mortality rate (No. deaths/total No. of patients)	OR (95% CI)	p
aPTT ≤ 45 (all patients)	25.4 (184/723)	0.64 (0.43/.96)	0.03
aPTT ≤ 45¹ (patients using heparin)	31 (50/164)	0.66 (0.30/1.45)	0.26
aPTT ≤ 45² (patients not using heparin)	24 (134/559)	0.54 (0.34/0.87)	0.007
Pooled results ^1,2		0.57 (0.38/0.86)	0.005

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