Table 2 Univariate analysis of continuous variable in relation to graft dilation ratio.

	Correlation ratio	95% confidence interval	P value
Age (years)	0.323	0.118–0.501	0.003
Initial graft size (mm)	−0.0834	−0.291–0.132	0.45
Postoperative systolic blood pressure (mmHg)	−0.029	−0.240–0.186	0.79
Postoperative mean arterial pressure (mmHg)	0.045	−0.170–0.256	0.68