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).