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Table 2: Comparison of quantitative measurements on each skull plain film between subgroups^{^a}
Group A Aneurysm (n = 62) Group B Aneurysm (n = 16) P Value
AP image 
    Differences in the largest diameter (mm) 0.54 ± 0.52 0.81 ± 0.57 .07
    Differences in the perpendicular diameter (mm) 0.36 ± 0.29 0.47 ± 0.59 .30
    Differences in area (mm²) 2.82 ± 2.52 5.12 ± 9.26 .08
Lateral image 
    Differences in the largest diameter (mm) 0.53 ± 0.43 1.17 ± 0.91 <.01^{^b}
    Differences in the perpendicular diameter (mm) 0.56 ± 0.48 1.20 ± 1.05 <.01^{^b}
    Differences in area (mm²) 5.21 ± 7.51 10.55 ± 10.93 .02^{^b}
↵a Changes in each parameter mean the absolute difference of measurement from each skull view between the initial and follow-up periods.
↵b Statistically significant (P < .05).

	Group A Aneurysm (n = 62)	Group B Aneurysm (n = 16)	P Value
AP image
Differences in the largest diameter (mm)	0.54 ± 0.52	0.81 ± 0.57	.07
Differences in the perpendicular diameter (mm)	0.36 ± 0.29	0.47 ± 0.59	.30
Differences in area (mm²)	2.82 ± 2.52	5.12 ± 9.26	.08
Lateral image
Differences in the largest diameter (mm)	0.53 ± 0.43	1.17 ± 0.91	<.01^{^b}
Differences in the perpendicular diameter (mm)	0.56 ± 0.48	1.20 ± 1.05	<.01^{^b}
Differences in area (mm²)	5.21 ± 7.51	10.55 ± 10.93	.02^{^b}