Table 1.

Comparison of Venogram and All Radiologic Studies Performed during each three-week Study Period

Number of studies by year	2019	2020	2021
Venograms	26	18	94
All Radiologic Studies	98,406	59,094	117,335
Proportions of Venograms	0.026%	0.030%	0.080%

Relative change in studies between years	2019–2020	2020–2021	2019–2021
Venograms	−  31%	422%	262%
All Radiologic Studies	−  40%	99%	19%
Proportions of Venograms	−  15%	163%	203%

The top portion of the table describes the total number of venograms and all radiologic studies for each study period. All radiologic studies include any performed within the 12 hospitals, 7 free-standing emergency departments, and 7 outpatient imaging centers included in this study

The bottom portion of the table describes the relative change in venograms and all radiologic studies between all three study years