Table 3.

Conditional logistic regression analysis related to intracranial aneurysm rupture.

Characteristics	OR (95% CI)	P-value
Bifurcation aneurysm	11.0 (5.4–22.1)	<0.001
Overweight [body mass index (BMI) ≥25]	0.6 (0.3–1.0)	0.045
Diabetes mellitus	0.3 (0.1–0.9)	0.032
Hyperlipidemia	0.3 (0.1–0.8)	0.016
Smoking (current/former smoking)	2.3 (1.1–4.8)	0.029
Conditional logistic regression results for current/former smokinga
Nonsmoker	Reference
Vs former smoker	1.1 (0.3–4.0)	0.929
Vs current smoker	2.8 (1.249–6.303)	0.012
Conditional logistic regression results for current mild/heavy smokinga
Nonsmoker	Reference
Vs former smoking	1.1 (0.2–4.2)	0.886
Vs current mild smoking	1.8 (0.6–5.3)	0.292
Vs current heavy smoking	4.0 (1.4–11.0)	0.007
Conditional logistic regression results for current smoking with different smoking indexa
Nonsmoker	Reference
Vs former smoker	1.0 (0.3–4.0)	0.989
Vs current smoking index <400	2.7 (0.9–8.2)	0.077
Vs current smoking index ≥400 and <800	1.4 (0.4–4.7)	0.686
Vs current smoking index ≥800	11.4 (2.3–24.5)	0.003

^aAdjusting for history of diabetes, history of hypertension, frequent alcohol use, education, and BMI.

OR, odds ratio. Heavy smoking, ≥20 per day; mild smoking, <20 per day.