Supplementary Table 2.

Predictors of sperm retrieval failure via multivariate logistic regression

Characteristic	OR (95% CI)	P
Testis volume (ml)	0.78 (0.63–0.95)	0.016
FSH (IU l−1)	0.97 (0.92–1.03)	0.386
Testosterone (nmol l−1)	0.97 (0.89–1.05)	0.432

OR: odds ratio; CI: confidence interval; FSH: follicle-stimulating hormone