Table 2.

The pooled data

		RR (95% CI)	p of RR	I2	p of Heterogeneity	p of Begg’s test	p of Egger’s test
Minimally invasive group vs. conservative group	Rate of patients with a GOS score > 4 points	1.546 (1.121, 1.972)	<  0.001	0.0%	0.763	0.734	0.093
	Pulmonary infection rate	0.610 (0.342, 1.086)	0.038	0.0%	0.489	1.000	0.917
	Mortality rate	0.265 (0.173, 0.404)	< 0.001	14.5%	0.321	0.707	0.425
Minimally invasive group vs. craniotomy group	Rate of patients with a GOS score > 4 points	1.678 (1.099, 2.590)	0.017	67.5%	0.015	0.221	0.178
	Rate of patients with a ADL score > 3 points	1.259 (1.133, 1.400)	< 0.001	0.0%	0.630	0.308	0.336
	Pulmonary infection rate	0.700 (0.430, 1.141)	0.449	77.8%	0.011	0.296	0.08
	Rebleeding rate	0.468 (0.263, 0.832)	0.001	0.0%	0.524	1.000	0.656
	Mortality rate	0.839 (0.649, 1.086)	0.182	44.9%	0.080	0.386	0.132

RR relative risk, GOS Glasgow Outcome Scale, ADL activities of daily living