Table 3. Sensitivity analysis.

Studies	p value for heterogeneity	I2	Pooled HR and 95% CI	p value for overall effect
All included	0.07	57%	1.30 [1.09, 1.55]	p = 0.004
Exclude Verwoert 2008	0.17	44%	1.39 [1.23, 1.57]	p<0.001
Exclude Fedorowski 2010	0.05	67%	1.35 [1.19, 1.53]	p<0.001
Exclude Lin 2011	0.04	70%	1.30 [1.17, 1.45]	p<0.001
Exclude Jones 2012	0.60	0%	1.18 [1.03, 1.35]	p = 0.01

HR, hazard ratio; CI, confidence interval.