Fig. 3
The upper panel shows the relationship between age and patency rate. The patency rate was also significantly lower in 75 years or older patients (dotted line, n = 41) than less than 75 years old patients (solid line, n = 98) (p = 0.04). Relationship between diameter of RA and patency rate is indicated in the lower panel. US findings of 2.0 mm or less in RA diameter (solid line, n = 11) are also resulted in a significantly lower patency rate than that of more than 2.0 mm (dotted line, n = 128) (p = 0.03)