Risk Prediction of Ureaplasma urealyticum Affecting Sperm Quality Based on Mathematical Model and Cross-Sectional Study

Table 4

(a) Comprehensive test of model coefficients^a

Step	-2 log likelihood	Overall (score)			Change from previous block
		Chi-square		Sig.	Chi-square		Sig.
1	973.020	105.539	6	0.000	105.539	6	0.000

Note: ^abeginning block number. 1 method: forward stepwise (likelihood ratio).

(b) Variables in an equation

Indicators		SE	Wald		Sig.		95.0% CI for
							Lower	Upper
pH	-0.284	0.206	1.903	1	0.168	0.753	0.503	1.127
PR	-0.020	0.008	5.736	1	0.017	0.980	0.964	0.996
NP	0.003	0.008	0.138	1	0.710	1.003	0.987	1.019
VCL	-0.062	0.010	42.107	1	0.000	0.940	0.922	0.957
STR	-2.505	0.466	28.851	1	0.000	0.082	0.033	0.204
SQ	-0.249	0.348	0.512	1	0.474	0.780	0.395	1.541

Note: pH: pH value; PR: sperm progressive motility; NP: nonprogressive motility; VCL: curvilinear velocity; STR: straightness (VSL/VAP); SQ: sperm quality (World Health Organization. 2010, 5^th, ed).