Table 4.

Aortic morphology and the risk of re-intervention within 30 days (with multiple imputation for missing variables) for 412 patients after exclusion of patients who either did not leave the operating theatre alive (n = 41) or had missing re-intervention data (n = 5)

Variable	EVAR commenced (23 patients with re-interventions, n = 167)		Open commenced (65 patients with re-interventions, n = 245)		Combineda (88 patients with re-interventions, n = 412)
	Odds ratio (95% CI)	P-value	Odds ratio (95% CI)	P-value	Odds ratio (95% CI)	P-value
Within IFU ( vs. outside)	0.64 (0.24, 1.67)	0.36	0.95 (0.50, 1.81)	0.87	0.85 (0.50, 1.44)	0.55
Maximum AAA diameter (per 17 mm increase)	0.76 (0.45, 1.29)	0.31	0.80 (0.58, 1.11)	0.18	0.79 (0.60, 1.04)	0.094
Aneurysm neck diameter at distal renal artery (per 4 mm increase)	1.12 (0.65, 1.92)	0.69	1.20 (0.82, 1.77)	0.35	1.16 (0.85, 1.58)	0.34
Aneurysm neck length (per 16 mm increase)	0.89 (0.53, 1.51)	0.67	1.13 (0.80, 1.61)	0.48	1.06 (0.79, 1.41)	0.72
Neck conicality (per 1.6% per mm change increase)	1.01 (0.41, 2.50)	0.98	0.62 (0.38, 1.01)	0.057	0.70 (0.45, 1.10)	0.12
Proximal aneurysm neck (α) angulation (per 20° increase)	0.78 (0.45, 1.34)	0.37	1.14 (0.86, 1.52)	0.37	1.04 (0.81, 1.35)	0.75
Maximum common iliac diameter (per 9 mm increase)	1.47 (0.94, 2.30)	0.089	1.16 (0.88, 1.54)	0.28	1.24 (0.98, 1.57)	0.071

All models adjusted for age, sex, Hardman Index, lowest recorded systolic blood pressure, and randomized group. Odds ratios are presented per standard deviation increase of morphological parameter.

^aAlso adjusted for operation commenced.