Fig. 9
Subgroup analysis of the association between restenosis and diagnostic methods. The vertical dashed lines indicate the pooled summary estimate (95% CI) for all studies in Fig. 9 (‘TLR’ subgroup, RR = 1.56, 95% CI, 1.35–1.80; I2 = 49.6%, P = 0.008, ‘Angiography’ subgroup, RR = 1.12, 95% CI, 0.94–1.33; I2 = 15.4%, P = 0.315.). The area of each square is proportional to the inverse variance of the estimate. The horizontal lines indicate the 95% confidence intervals of the estimate