Table 2.

Odds ratio for low fertilization rate predictors

Characteristic	Low fertilization rate odds ratio (95% CI)
	Training set (N = 332)	Validation set (N = 331)
Postprocessing sperm concentration (million/ml)	0.97 (0.96, 0.99)	0.98 (0.96, 0.99)
Postprocessing sperm progressive motility (%)	0.94 (0.91, 0.97)	0.96 (0.93, 0.98)
	Area under the curve (95% CI)
	0.72 (0.67, 0.83)	0.66 (0.56, 0.76)

Data is presented as the effect of 1 unit of increase in the odds ratio in relation to having a low fertilization (≤ 30% fertilization rate). Estimates were calculated using stepwise selection of the following predictors: age (years), BMI (kg/m²), ethnicity, infertility diagnosis, antral follicle count, IVF cycle type, duration of infertility (months), FSH levels at day 3 (pg/ml), estradiol levels at day 3 and at trigger (pg/ml), day of HCG trigger, units of IVF medication utilized for induction (IU), initial immature round cells (mil/ml), initial concentration (mil/ml), initial normal morphology (%), initial progressive motility (%), postprocessing progressive motility (%). Model was weighted by the total number mature (M2) oocytes retrieved