Fig. 2. Changes of neonatal survival rates for very-low-birth-weight infants (VLBWI) and extremely low birth weight infants (ELBWI) in Korea (1960-2014. 6.). ^*P < 0.05 vs. late 1960s; ^†P < 0.001 vs. late 1960s; ^‡P < 0.05 vs. late 1960s; ^§P < 0.001 vs. late 1960s; ^∥data acquisition from Kim et al., Korean J Pediatr 2008 (reference 17); Park et al., J Korean Soc Neonatol 2004 (reference 5); Hahn et al., J Korean Soc Neonatol 2009 (reference 6) and Hahn et al., J Korean Med Sci 2011 (reference 7). ELBWI, extremely low birth weight infants; VLBWI, very-low-birth-weight infants.