Table 2.

Patients characteristics.

Group	Number	Age range ($\overline{X}\pm s$, years)	weight ($\overline{X}\pm s$, kg)	Gender ratio (male/female)
Control group	56	3.32 ± 2.72	15.56 ± 8.08	30/26
Observation group	58	4.33 ± 3.24	18.39 ± 9.97	30/28
t/χ 2		1.795	1.669	0.039
P		0.075	0.098	0.843