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Table 4: Cox proportional hazards model to find factors associated with aneurysm enlargement
Single Cox Proportional Hazards Model
Hazard Ratio 95% CI P Value
Age (yr) 0.93 0.85–1.01 .086
Male sex 0.54 0.09–3.22 .50
Clinical presentation at diagnosis 
    Asymptomatic Reference – –
    Pain 2.83 0.29–27.3 .37
    Mass effect 9.38 0.56–156 .12
Size 
    Maximum diameter (mm) 1.30 1.11–1.52 .001
    ≥10 mm 18.0 1.95–167 .011
Hypertension 0.38 0.06–2.34 .30
Diabetes^{^a} 
Hyperlipidemia 0.88 0.10–7.92 .91
Smoking 0.85 0.14–5.10 .86
Location 
    Left 0.13 0.01–1.65 .12
    Right 0.19 0.02–1.57 .12
    Bilateral Reference 
Note:—CI indicates confidence interval.
↵a All 6 patients with diabetes were excluded from this analysis because their aneurysms were unchanged.

	Single Cox Proportional Hazards Model
	Hazard Ratio	95% CI	P Value
Age (yr)	0.93	0.85–1.01	.086
Male sex	0.54	0.09–3.22	.50
Clinical presentation at diagnosis
Asymptomatic	Reference	–	–
Pain	2.83	0.29–27.3	.37
Mass effect	9.38	0.56–156	.12
Size
Maximum diameter (mm)	1.30	1.11–1.52	.001
≥10 mm	18.0	1.95–167	.011
Hypertension	0.38	0.06–2.34	.30
Diabetes^{^a}
Hyperlipidemia	0.88	0.10–7.92	.91
Smoking	0.85	0.14–5.10	.86
Location
Left	0.13	0.01–1.65	.12
Right	0.19	0.02–1.57	.12
Bilateral	Reference