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Table 2: Index values for growing and stable aneurysms segregated by size^{^a}
Index
<3 mm (n = 95) 3–5 mm (n = 160) 5–7 mm (n = 65) >7 mm (n = 28) All^{^b} (n = 348) Initial^{^c} (n = 93)
Maximum diameter 
    Growing 2.21 ± 0.66 3.93 ± 0.58 6.09 ± 0.58 8.55 ± 1.28 4.64 ± 2.33 3.98 ± 2.09
    Stable 2.22 ± 0.55 3.82 ± 0.52 5.77 ± 0.58 8.78 ± 1.52 4.03 ± 1.78 4.14 ± 1.84
Volume 
    Growing 9.41 ± 8.51 49.2 ± 49.7 151 ± 119 572 ± 287^{^d,^e} 145 ± 235^{^d,^e} 110 ± 197
    Stable 12.5 ± 6.88 30.4 ± 20.9 108 ± 68.9 150 ± 261^{^d} 46.7 ± 81.0^{^d} 57.0 ± 106
Surface area 
    Growing 28.1 ± 15.9 75.1 ± 49.4 144 ± 85.6 384 ± 165^{^d,^e} 126 ± 146^{^d,^e} 105 ± 133
    Stable 30.0 ± 13.2 50.6 ± 26.4 122 ± 60.4 116 ± 140^{^d} 61.9 ± 57.4^{^d} 70.1 ± 69.5
NSI 
    Growing 0.45 ± 0.08^{^d,^e} 0.36 ± 0.10^{^d,^e} 0.26 ± 0.05 0.31 ± 0.08^{^d,^f} 0.36 ± 0.11^{^d,^e} 0.38 ± 0.11^{^d,^f}
    Stable 0.31 ± 0.14^{^d} 0.27 ± 0.10^{^d} 0.29 ± 0.09 0.22 ± 0.03^{^d} 0.28 ± 0.11^{^d} 0.29 ± 0.12^{^d}
Aspect ratio 
    Growing 0.89 ± 0.54 0.91 ± 0.33 1.21 ± 0.34 1.21 ± 0.27 1.03 ± 0.43 1.01 ± 0.54
    Stable 0.90 ± 0.24 0.99 ± 0.29 1.09 ± 0.33 1.27 ± 0.81 1.00 ± 0.34 1.02 ± 0.40
Size ratio 
    Growing 0.56 ± 0.25 0.94 ± 0.31 2.93 ± 1.3^{^d,^f} 2.48 ± 0.71 1.49 ± 1.20 1.21 ± 0.91
    Stable 0.70 ± 0.30 1.05 ± 0.34 1.63 ± 0.59^{^d} 1.96 ± 1.11 1.11 ± 0.59 1.19 ± 0.68
↵a Data are presented as mean ± SD.
↵b The “All” column includes all imaging studies for all cases.
↵c The “Initial” column includes the first imaging study for all cases.
↵d Significant difference between groups.
↵e P < .001.
↵f P < .01.