The risks of waiting for cardiac catheterization: a prospective study

Fig. 2: Median number of days from referral to cardiac catheterization or cancellation of procedure, by requested waiting time, for inpatients and outpatients. The bottom of each box represents the 75th percentile; thus, the height of the box is the interquartile range (IQR). The white line represents the median. Values that lie more than 1.5 IQRs beyond the top or bottom of the box (outliers) are shown as individual lines. The square brackets connected by dotted lines to the top and bottom of the box represent the most extreme values not more than 1.5 IQRs beyond the box. For inpatients, the median waiting time and proportion who underwent catheterization within the requested waiting time were as follows: < 48 hours: 3 (IQR 4) days, 48%; < 7 days: 6 (IQR 4) days, 50%; < 14 days: 7 (IQR 7) days, 82%. The corresponding values for outpatients were: < 14 days: 21 (IQR 18) days, 28%; < 42 days: 56 (IQR 44) days, 29%; < 90 days: 133 (IQR 88) days, 29%.