Variables | βa | SEb | HR | 95% CI | P |
---|---|---|---|---|---|
Maternal age (reference: <30) | |||||
 30–35 | 0.0733 | 0.1102 | 1.08 | 0.87–1.34 | 0.506 |
 36–40 | 0.3758 | 0.1697 | 1.46 | 1.04–2.03 | 0.027 * |
  > 40 | 1.1000 | 0.3222 | 3.00 | 1.60–5.65 | <0.001 * |
COH protocol (reference: GnRH-a long protocol) | |||||
 GnRH-a short protocol | 0.0326 | 0.1191 | 1.03 | 0.82–1.30 | 0.784 |
 GnRH antagonist protocol | 0.8914 | 0.2698 | 2.44 | 1.44–4.14 | <0.001 * |
 Minimal stimulation protocol | 0.7869 | 0.2152 | 2.20 | 1.44–3.35 | <0.001 * |
 GnRH-a rolonged protocol | −0.1192 | 0.4160 | 0.89 | 0.39–2.01 | 0.774 |
 Other protocol | 1.3692 | 0.5070 | 3.93 | 1.46–10.62 | 0.007 * |
Cycle Type (reference: Fresh) | |||||
 Frozen | 0.2296 | 0.1057 | 1.26 | 1.02–1.55 | 0.030 * |
Serum hCG levels 14 days after transfer (reference: < 695.30) | |||||
  ≥ 695.30 | −1.0848 | 0.1180 | 0.34 | 0.27–0.43 | <0.001 * |