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Table 3 Odds ratio and adjusted odds ratio for live birth rate after multivariate logistic regression. They were controlled for all variables mentioned in the table

From: Optimal parameters for determining the LH surge in natural cycle frozen-thawed embryo transfers

Parameter Odds ratio (95% CI) Adjusted odds ratio (95% CI) Standard error P value
Body mass indexa
  < 30 kg/m2 5.6 (2.3–13.8) 6.6 (2.6–16.8) 3.1 <0.001
Blastocyst gradingb
 Excellent <0.001
 Good 3.7 (1.3–10.0) 4.5 (1.5–13.2) 2.4 0.006
 Average 4.2 (2.0–8.4) 4.9 (2.2–10.8) 1.9 <0.001
Definition of LH surgec
 Group A 1.6 (1.1–2.5) 1.7 (1.1–2.8) 0.42 0.01
Number of transferred blastocystsd
 2 1.1 (0.7–1.6) 1.1 (0.7–1.8) 0.2 0.4
 3 5.7 (0.6–49.7) 3.2 (0.3–33.0) 3.8 0.3
  1. a compared to ≥30 kg/m2
  2. b compared to poor embryos
  3. c compared to group B
  4. d compared to 1 blastocyst