Table 2. Comparison of Selected Data Between ELBW Children and the Control Group.

	Study Group	Control Group	P Value
Birth parameters
Female/male	44/23	19/23	0.15
Birth weight ( g)	850 ± 128	3571 ± 538	< 0.001
Gestational age (wk)	27 ± 2.27	39.8 ± 1.42	< 0.001
Neonatal period interventions
Mechanical ventilation (%)	91	0	< 0.001
Surfactant administration (%)	73	0	< 0.001
PDA ligation (%)	27	0	< 0.001
First follow-up
Height (cm)	115.5 ± 6.7	124.9 ± 7.4	< 0.001
Height (z-score)	-0,89	0,18	< 0.001
Weight (kg)	19.5 ± 3.9	25.2 ± 5.3	< 0.001
Weight (z-score)	-0.9	0.2	< 0.001
Second follow-up
Height (cm)	142 ± 7	145 ± 9	0.09
Height (z-score)	- 1.09	0.21	< 0.001
Weight (kg)	34 ± 8	39±8	0.017
Weight (z-score)	- 1.32	0.12	< 0.001

Abbreviation: ELBW, extremely low birth weight.