project

ROP group (n = 32)

Non-ROP group (n = 158)

X² value

P value

Gestational age

<28 weeks

26 (81.25)

51 (32.28)

7.454

<0.001

28 - 34 weeks

6 (18.75)

107 (67.72)

Gender

Male

15 (46.87)

80 (50.63)

0.304

0.582

Female

17 (53.13)

78 (49.37)

Birth weight

<1500 g

24 (75.0)

52 (32.91)

18.386

<0.001

≥1500 g

8 (25.0)

106 (67.09)

Bronchopulmonary dysplasia

19 (59.38)

28 (17.72)

15.386

0.001

Mechanical Ventilation

10 (31.25)

34 (21.52)

2.566

0.105

Maternal factors

Age

27.18 ± 3.14

26.87 ± 3.72

0.744

0.451

fetal distress

21 (65.63)

117 (74.05)

6.263

0.011

Gestational hypertension

17 (53.13)

117 (74.05)

34.166

<0.001

Anemia

7 (21.88)

50 (31.65)

1.072

0.323

Blood transfusion

19 (59.38)

40 (25.32)

0.856

0.355

Mode of delivery

Natural delivery

12 (37.5)

80 (50.63)

0.155

0.698

Cesarean section

20 (62.5)

78 (49.37)

Oxygen usage

Oxygen concentration > 50%

21 (65.62)

50 (31.65)

35.863

<0.001

Oxygen concentration ≤ 50%

11 (34.38)

108 (68.35)