Table 1. A comparison of the general patient characteristics.

Variable	Observation group (n=56)	Control group (n=60)	t/χ2 value	P value
Gender (male/female)	26/30	32/28	0.552	0.457
Gestational age (weeks)	38.51±1.45	38.47±1.13	0.166	0.868
Head circumference (cm)	33.65±3.46	34.53±3.74	1.313	0.192
Weight (kg)	3.25±0.43	3.32±0.45	0.855	0.394