| Control Group | Study Group | p |
Gestational age (week) | 31 (26 - 35) | 29 (23 - 35) | <0.001* |
Birth weight (gram) | 1757 (820 - 2830) | 1332 (490 - 2850) | <0.001* |
Length of stay in incubator (day) | 24(2 - 120) | 46 (6 - 195) | <0.001* |
Gender(male/female) | 98/91 | 74/54 | 0.304 |