Fig. 3. Changes of neonatal survival rates by gestational period in Korea (2002-2014. 6). ^*P < 0.015, 2007 vs. 2002; ^†P < 0.015, 2009 vs. 2002; ^‡P < 0.015, 2013-2016.6 vs. 2002; ^§data acquisition from Park et al., J Korean Soc Neonatol 2004 (reference 5); ^∥data acquisition from Hahn et al., J Korean Soc Neonatol 2009 (reference 6); ^¶data acquisition from Hahn et al., J Korean Med Sci 2011 (reference 7).