Table 1 General characteristics of the infants

Number and Gender (F/M)

22 (15/7)

52 (36/16)

74 (51/23)

Gestational age (weeks)

38.23 ± 2.20

38.67 ± 1.62

38.54 ± 1.81

Birth weight (kg)

2.61 ± 0.58

2.91 ± 0.47

2.82 ± 0.52

Operation

Thoracoscope

12

31

43

Open

10

21

31

Congenital heart disease

11

6

17

Mechanical ventilation

2

3

5