Primary and secondary outcomes stratified by gestational age at birth.

Data represents median, 25th–75th percentile and minimum-maximum or N (%), unless otherwise stated.
BD = below detection limit.
Counts below the detection limit were assigned the value 4.4 [log10(27,500)] for analysis.
p-values<0.025 considered significant after Bonferroni adjustment.
S2-S1: Difference between sample 2 and sample 1.
*Chi- square test was used to generate p values.