Normal fertilisation rates and serum 25-OHD levels among couples undergoing in-vitro fertilisation: a prospective cohort study

Table 2 Generalized linear regression analysis among all covariates and normal fertilisation rate

	OR	95%CI lower limit	95%CI upper limit	P value
Male 25-OHD ^a
Group A	REF
Group B	1.005	0.955	1.058	.854
Group C	0.994	0.931	1.061	.847
Primary infertility
Yes	0.960	0.923	0.998	.042
No	REF
Stimulation protocol
GnRH-ant	0.958	0.915	1.044	.072
GnRH-a prolonged	0.974	0.927	1.023	.290
GnRH-a long	REF
Female 25-OHD ^b
Group A	REF
Group B	1.054	1.001	1.110	.044
Group C	1.111	1.041	1.187	.002
BMI (kg/m2)	0.996	0.989	1.003	.301
Female age (y)	1.002	0.995	1.008	.624
Male age (y)	1.000	0.994	1.005	.971
PR (%)	1.001	0.999	1.002	.246
Baseline FSH (mIU/ml)	1.010	0.993	1.026	.255
Duration of infertility (y)	0.994	0.986	1.001	.114
Number of oocytes retrieved	0.996	0.992	0.999	.006
Daily dose of Gn (IU)	0.974	0.953	0.996	.021

Table 2 depicts the generalized linear regression results of serum 25-OHD levels in couples and normal fertilisation rates. ^a Serum 25-OHD levels in men were classified into three groups: < 16.3 ng/ml (Group A), 16.3–32.8 ng/ml (Group B), > 32.8 ng/ml (Group C). ^b Serum 25-OHD levels in women were classified into three groups: < 13.3 ng/ml (Group A),13.3–25.9 ng/ml (Group B), > 25.9 ng/ml (Group C). Abbreviations: Sperm progressive motile sperm rate (PR)

ISSN: 1471-2393