Table 2. Univariate (crude) and adjusted odd ratios of pregnancy for each of the studied variables by fitted logistic regression models.
| Characteristics | Simple univariate models | Primary multiple-model | Final reduced model | |||
|---|---|---|---|---|---|---|
| Odds Ratio (95% CI*) |
p-values | Odds Ratio (95% CI) |
p-values | Odds Ratio (95% CI) |
p-values | |
| Number of injected HMG | 1.00 (0.97,1.03) | 0.7 | 1.02 (0.98,1.05) | 0.4 | - | - |
| Number of follicles formed | 1.08 (0.97,1.22) | 0.1 | 1.07 (0.89,1.29) | 0.4 | - | - |
| Number of retrieved oocytes | 1.04 (0.95,1.14) | 0.4 | 0.88 (0.74,1.05) | 0.1 | - | - |
| Number of embryos formed | 1.23 (1.02,1.48) | 0.03 | 1.10 (0.78,1.54) | 0.6 | - | - |
| Number of embryos transferred | 1.41 (1.06,1.86) | 0.02 | 1.34 (0.79,2.26) | 0.3 | 1.32 (1.00,1.75) | 0.048 |
| Sperm Status** | 1.23 (0.90,1.66) | 0.2 | 1.00 (0.67,1.52) | 0.9 | - | - |
| FSH levels above 10(mIU/ml) | 0.46 (0.13,1.65) | 0.2 | 0.76 (0.18,3.28) | 0.7 | - | - |
| Spinal analgesia | 2.49 (1.15,5.41) | 0.02 | 2.01 (0.93,4.34) | 0.08 | 2.07 (1.02,4.20) | 0.043 |
| Infertility due to feminine factor | 0.54 (0.26,1.16) | 0.1 | 0.46 (0.16,1.31) | 0.1 | 0.42 (0.22,0.82) | 0.01 |
| Age over 30 years | 0.72 (0.34,1.53) | 0.4 | 0.69 (0.29,1.62) | 0.4 | - | - |
| BMI greater than 25 | 0.96 (0.45,2.05) | 0.9 | 0.87 (0.39,1.97) | 0.7 | - | - |
| C and/or D embryonic Grade | 0.33 (0.12,0.91) | 0.03 | 0.19 (0.06,0.58) | 0.004 | 0.20 (0.07,0.53) | 0.001 |
*Confidence Interval, ** 0=normal, 1=oligo-spermia, 2=oligo-astheno-spermia, 3= Azo-spermia, ‹Body mass index