Table 1.

The demographic data and MRI type

	Group P (N = 356)	Group PM (N = 541)
Age (yr)	6.1 ± 2.6	5.8 ± 2.4
Weight (kg)	21.9 ± 8.5	21.2 ± 8.0
Sex (male/female)	197/159 (55/45)	294/247 (54/46)
ASA class (I/II)	133/223 (38/62)	228/313 (42/58)
MRI type
Abdomen	8 (2.2)	9 (1.7)
Brain	183 (51.4)	248 (45.8)
Extremity	9 (2.5)	14 (2.6)
Mediastinum & Lung	12 (3.4)	46 (8.5)
Neck	19 (5.3)	23 (4.3)
Orbit	31 (8.7)	58 (10.7)
Parotid gland	3 (0.8)	5 (0.9)
Pelvis	3 (0.8)	14 (2.6)
Sella	33 (9.3)	30 (5.5)
Spine	42 (11.8)	53 (9.8)
Temporal lobe	13 (3.7)	41 (7.6)

Data are mean ± SD or number (%)

ASA American Society of Anesthesiology, MRI magnetic resonance imaging