Table 1. Patient characteristics and radiation dose.

	Training set		Validation set	p-value	Dose reduction*** (%)
	Standard-dose CT (120 kVp, n = 42)	Low-dose CT (80 kVp, n = 42)	Low-dose CT (80 kVp, n = 41)
Sex (boys/girls)	24/18	31/11	24/17	0.21*
Age (years)	6.2±2.2	7.2±2.5	7.4±2.2	0.59
CTDIvol (mGy)	4.1±1.1	2.6±0.5	2.5±0.4	< 0.001**	36.6
DLP (mGy·cm)	156.2±54.3	105.4±30.0	98.9 ± 22.9	< 0.001**	32.5
ED (mSv)	4.4±1.1	3.0±0.6	2.8±0.5	< 0.001**	31.8

* Pearson chi-square.

** Differences between standard dose CT and low dose CT from ANOVA test.

*** Calculated in training datasets between standard dose CT and low dose CT.