Trajectory Modelling to Assess Trends in Long-Term Readmission Rate among Abdominal Aortic Aneurysm Patients

Table 1

Covariates associated with high-impact users compared to low-impact users among patients who had elective AAA repair.

Risk factors	Low-impact users	High-impact users	Odds ratio (95% CI)	value
Patient demographics
Living alone	49 (0.3)	24 (0.8)	1.65 (1.21–2.25)	0.11
Female sex	1829 (13.1)	509 (16.9)	1.23 (1.15–1.32)	0.001
Socioeconomic index	2.8 (1.3)	3.1 (1.3)	1.13 (1.11–1.15)	<0.001
Age	73.1 (SD 7.3)	75.6 (SD 7.1)	1.04 (1.04–1.04)	<0.001
Non-Caucasian ethnicity	2081 (14.9)	297 (9.9)	0.61 (0.57–0.66)	<0.001
Past medical history
Diabetes	1477 (10.6)	409 (13.6)	1.22 (1.07–1.39)	0.11
Anaemia	350 (2.5)	105 (3.5)	1.21 (1.06–1.37)	0.17
Ischaemic heart disease	1478 (10.6)	414 (13.8)	1.15 (1.07–1.23)	0.06
Mental health disorders	169 (1.2)	55 (1.8)	1.12 (0.91–1.36)	0.57
Hypotension	232 (1.7)	59 (1.9)	1.05 (0.88–1.26)	0.76
Comorbidity score	3.9 (SD 5.7)	5.6 (SD 6.6)	1.04 (1.04–1.05)	<0.001
Stroke	202 (1.4)	85 (2.8)	0.98 (0.83–1.16)	0.92
Hypertension	7556 (64.1)	1645 (54.7)	0.97 (0.92–1.02)	0.47
Chronic peripheral vascular disease	671 (4.8)	161 (5.4)	0.80 (0.72–0.90)	0.05
Heart failure	435 (3.1)	125 (4.2)	0.59 (0.51–0.68)	<0.001
Management factors
Urinary tract infection	272 (1.9)	79 (2.6)	1.31 (1.08–1.58)	0.17
Wound infection	316 (2.3)	80 (2.7)	1.22 (1.04–1.42)	0.19
Other vascular procedures	3842 (27.5)	1167 (38.8)	1.21 (1.14–1.28)	0.003
Revision of graft	32 (0.2)	9 (0.3)	1.21 (0.81–1.80)	0.67
Other graft complications	287 (2.1)	89 (2.9)	1.12 (0.96–1.30)	0.46
Respiratory tract infection	1083 (7.7)	228 (7.6)	1.01 (0.87–1.17)	0.94
Prolonged length of stay	10.6 (SD 11.6)	11.5 (SD 12.7)	1.00 (1.00–1.01)	<0.001
Wound dehiscence	589 (4.2)	133 (4.4)	0.97 (0.86–1.09)	0.75
Total number of HACs	0.24 (0.51)	0.27 (0.53)	0.92 (0.83–1.03)	0.42
Acute peripheral vascular disease	337 (2.4)	78 (2.6)	0.92 (0.79–1.07)	0.59
Other procedures	733 (5.2)	135 (4.5)	0.87 (0.77–0.98)	0.23
Pulmonary embolism/deep venous thrombosis	56 (0.4)	7 (0.2)	0.87 (0.52–1.45)	0.78
Gastrointestinal complications	571 (4.1)	106 (3.5)	0.83 (0.73–0.94)	0.13
Other procedural complications	150 (1.1)	27 (0.9)	0.78 (0.60–1.01)	0.31
Discharge to nursing home	53 (0.4)	12 (0.4)	0.76 (0.52–1.12)	0.47
Graft infection	56 (0.4)	11 (0.4)	0.73 (0.49–1.11)	0.44
Renal failure	508 (3.6)	115 (3.8)	0.72 (0.63–0.82)	0.01
Open AAA repair	9292 (66.5)	1509 (50.2)	0.61 (0.58–0.65)	<0.001
Cardiac arrest	148 (1.1)	9 (0.3)	0.26 (0.17–0.39)	<0.001