Table 3.

Rates of and Medicare payments for disease-related and other inpatient events during follow-up

Event	EVR	Open repair	P value*
N at risk (surviving index operation)	6,775	1,822
Total person-years of follow-up	15,455.1	6,392.6
DISEASE-RELATED EVENTS
90-day readmission
% of patients (n patients)	12.9 (874)	17.8 (325)	<0.001
Median payment per readmission, $	$10,365	$10,766	0.552
AAA-related reintervention
n events (n patients)	614 (513)	136 (113)
Events per 100 person-years	4.0	2.1	0.041
Median payment per event, $	$24,401	$31,776	<0.001
Abdominal wall operation
n events (n patients)	95 (91)	95 (88)
Events per 100 person-years	0.6	1.5	<0.001
Median payment per event, $	$16,977	$17,015	0.948
Surveillance imaging studies
% patients with ≥1 study (n patients)	96.8 (6,559)	72.3 (1,317)
Imaging studies per person-year	1.8	0.7	<0.001
Median payment per imaging study, $	$210	$145	<0.001
OTHER EVENTS
Other vascular procedures
n events (n patients)	197 (188)	94 (82)
Events per 100 person-years	1.3	1.5	<0.001
Median payment per event, $	$16,216	$14,040	0.212
Other non-vascular procedures
n events (n patients)	252 (211)	126 (88)
Events per 100 person-years	1.6	2.0	<0.001
Median payment per event, $	$20,767	$24,386	0.216
Admissions > 90 days post-discharge
n events (n patients)	6,226 (2,532)	2,484 (844)
Events per 100 person-years	40.3	38.9	<0.001
Median payment per event, $	$9,178	$9,370	0.438

^*Counts of AAA-related reinterventions, abdominal wall operations, surveillance images, other vascular non-vascular procedures and admissions > 90 days post-discharge compared using unadjusted Poisson regression. Percent of patients with 90-day readmission compared using chi-squared test.