Variable

Category

N (%) or

mean ± SD

Min-max

Children (n = 280)

birth weight

<1000 g

110 (39.3)

1000 - 1499 g

170 (60.7)

Pregnancy age

<28 Week

98 (35.0)

28 - 36 Week

182 (65.0)

Gender

male

142 (50.7)

female

138 (49.3)

branch of insurance

Health insurance

273 (97.5)

medical assistance

7 (2.5)

polyembryony

Yes

30 (10.7)

Birth defects

Yes

48 (17.1)

Mechanical ventilation

Yes

228 (79.6)

Application of alveolar surfactant drugs

Yes

183 (65.4)

Central venous catheterization

Yes

173 (61.8)

Total parenteral nutrition

Yes

133 (47.5)

operation

Yes

27 (9.6)

Number of secondary diagnoses

14.1 ± 8.4

2.0 - 18.0