Patient demographics
A total of 1479 couples were included in the analysis (Figure 1). The median age of mothers was 32.9 years (range=[19.9, 45.2]), which was lower than the median age of fathers (35.2 years; range=[20.5, 65.4]) (Table 1). The median BMI of mothers (24.4 kg/m2; range=[ 16.2, 55.9]), was in the normal weight category, although BMI spanned both underweight (<18.5 kg/m2) through obese class III (>40 kg/m2) categories. The median BMI of fathers (27.4 kg/m2; range=[17.3, 54.2]), was in the overweight category, and similar to mothers, spanned from underweight to obese class III (Table 1). The mean (SD) SEIFA score was 994 (72), indicating a slightly lower score than the Australian benchmark of 1000, indicating social disadvantage. Male factor infertility was the biggest contributing infertility diagnosis (55%) to the cohort (Table 1). ICSI insemination was used in over 80% of cases with delivery method (vaginal vs caesarean) and infant sex (female vs male) split approximately 50% (Table 1).