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Table 2: Distribution of the study variables and association with aneurysm rupture based on crude and adjusted prevalence ratios according to the Poisson regression model with robust variance and their respective 95% CIs
Variables Crude PR Adjusted PR
PR (95% CI) P Value PR (95% CI) P Value
Sex .428 .938
    Female 1 – 1 –
    Male 1.09 (0.88–1.37) .428 1.01 (0.81–1.25) .938
Age .413 .640
    55 yr or younger 1.09 (0.88–1.36) .413 1.05 (0.83–1.31) .640
    Older than 55 yr 1 – 1 –
Aneurysm location .009 .022
    Postsiphon 1.18 (0.91–1.52) .208 1.11 (0.86–1.44) .416
    Supraclinoid segment 1 – 1 –
Aneurysm size .134 .445
    ≤5 mm 3.92 (1.04–14.81) .044 2.18 (0.57–8.27) .252
    6–10 mm 3.49 (0.92–13.27) .066 1.96 (0.51–7.52) .326
    11–25 mm 3.20 (0.83–12.42) .092 1.91 (0.49–7.40) .350
    >25 mm 1 – 1 –
Anterior knee angle .001 .005
    ≤15.40° 1 – 1 –
    >15.40° 1.45 (1.16–1.80) .001 1.36 (1.09–1.69) .005
Posterior knee angle .685 .773
    ≤88.15° 1 – 1 –
    >88.15° 1.05 (0.84–1.30) .685 1.03 (0.84–1.27) .773
Note:—PR indicates prevalence ratio.