Statistical analysis was performed using Stata Statistical Software (StataCorp. 2021. Stata Statistical Software: Release 17). Descriptive data were presented using proportion, mean and standard deviation or median and interquartile range as appropriate. Differences in prematurity groups or periods were compared by chi-square test or Kruskal-Wallis rank test. Percentage change in mortality within prematurity groups was calculated using the formula:
Percent change in mortality = [(mortality in 2015–2017 – mortality in 2008–2011)/mortality in 2008–2011]*100.
Incidence rates for early neonatal deaths (0–7 days), later neonatal deaths (8 (link)–20 , 27 (link)–34 (link)) and infant deaths were calculated for each prematurity groups and Kaplan-Meyer curves created. SCBU stay duration and secondary outcomes were evaluated from medical charts of neonates who survived the early neonatal period, and for whom data were available from the first 24h of life.
Percent change in mortality = [(mortality in 2015–2017 – mortality in 2008–2011)/mortality in 2008–2011]*100.
Incidence rates for early neonatal deaths (0–7 days), later neonatal deaths (8 (link)–20 , 27 (link)–34 (link)) and infant deaths were calculated for each prematurity groups and Kaplan-Meyer curves created. SCBU stay duration and secondary outcomes were evaluated from medical charts of neonates who survived the early neonatal period, and for whom data were available from the first 24h of life.
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