Comparison of demographic details of the two cohorts, 2004–2006 and 2008–2010
| 2004–2006 | 2008–2010 | p-value | |
| Subjects | 16 | 44 | |
| Birthweight g | 720 (480–1000) | 755 (410–1300) | 0.564# |
| Gestation weeks | 25 (23–29) | 26 (23–29) | 0.358# |
| Male | 10 (62.5) | 23 (52.3) | 0.481¶ |
Data are presented as n, median (range) or n (%), unless otherwise stated. #: Mann–Whitney U-test; ¶: Chi-squared.