Statistical analyses
SPSS version 24 software (SPSS, Chicago, Illinois, USA) was used for
analysis. Descriptive statistical analysis was described as median ±
range. Multivariate Poisson regression was used to evaluate the effect
of the aforementioned variables with the number of oocytes retrieved.
Mann Whitney U test was used to determine a relationship between the
variables and their effect on OHSS. The Kruskal Wallis test and Mann
Whitney U tests were used to determine significance between age groups
and probability of livebirth based upon their age and number of oocytes
retrieved. Chi squared testing was utilised to determine statistical
significance in those who returned to use their oocytes, to assess
between age groups and achievement of livebirth. Statistical
significance was set at p<0.05.