Prone versus Supine Position Ventilation in Adult Patients with Acute Respiratory Distress Syndrome: A Meta-Analysis of Randomized Controlled Trials

Table 3

Subgroup analysis for mortality.

Factor	Subgroups	Number of studies	RR and 95% CI	value	Heterogeneity (%)	value for heterogeneity	value between subgroups
Sample size	≥100	5	0.89 (0.74–1.06)	0.198	70.0	0.010	0.135
	<100	6	0.69 (0.47–1.02)	0.064	0.0	0.942
Mean age (years)	≥60.0	3	0.98 (0.86–1.12)	0.768	0.0	0.608	0.245
	<60.0	8	0.77 (0.60–0.99)	0.042	51.6	0.044
Percentage male (%)	≥70.0	7	0.99 (0.90–1.10)	0.906	0.0	0.582	0.001
	<70.0	4	0.70 (0.58–0.85)	<0.001	0.0	0.595
Duration of intervention	≥3.0 days	9	0.87 (0.74–1.02)	0.079	50.5	0.040	0.466
	<3.0 days	2	0.69 (0.32–1.51)	0.358	0.0	0.758
Protective lung ventilation	Yes	6	0.77 (0.63–0.93)	0.006	10.7	0.347	0.012
	No	5	0.98 (0.86–1.12)	0.759	18.0	0.300
Study quality	High	7	0.87 (0.72–1.05)	0.139	61.2	0.017	0.329
	Low	4	0.81 (0.61–1.06)	0.119	0.0	0.943