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)