Does the FNA sperm retrieval failure prediction model work well for current NOA individuals undertaking risk screening before the operation? Model validation, high-risk population identification and potential alternative sperm retrieval exploration

Table 4 Risk prediction model 3

Variable	Coefficient (95% CI)	P	OR (95% CI)
Constants	-1.140 (-1.670, -0.621)	< 0.001	0.320 (0.188,0.537)
Testicular volume: 12–14 ml	-0.391 (-0.867,0.084)	0.107	0.676 (0.420,1.087)
Testicular volume: >=15 ml	-1.451 (-1.963, -0.947)	< 0.001	0.232 (0.139,0.384)
FSH	0.167 (0.135,0.201)	< 0.001	1.182 (1.144,1.223)
Epididymis status	-0.870 (-1.388, -0.375)	< 0.001	0.419 (0.250,0.687)
Age	-1.438 (-2.144, -0.787)	< 0.001	0.237 (0.117,0.455)

ISSN: 1472-6947