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Table 1 Demographic features and clinical parameters between two groups

From: Is a high serum copper concentration a risk factor for implantation failure?

  NP (n = 173) P (n = 96) P value
Age (years) 34.8 ± 3.8 34.1 ± 4.0 NS
BMI (kg/m2) 21.0 ± 2.6 21.2 ± 3.5 NS
Cu (μg/dL) 193.2 ± 31.4 178.1 ± 34.4 0.0004
Zn (μg/dL) 75.5 ± 14.1 90.7 ± 38.8 0.0003
Cu/Zn ratio 2.66 ± 0.71 2.23 ± 0.83 0.00003
E2 (pg/mL) 271 ± 167 302 ± 168 NS
P4 (ng/mL) 13.1 ± 4.9 13.2 ± 4.7 NS
hCG (IU/L) 0.3 ± 1.1 555 ± 488 <0.00001
Ceruloplasmin (mg/dL) 39.6 ± 6.0 NT
  1. Patients who were at the first freeze and thaw embryo transfer attempt with good blastocysts (3BB or more with Gardner’s classification) and who were <40 years old were included. Values indicate the mean ± standard deviation. The Student’s t test (non-homogeneity, two-sided) was used for comparisons between two groups
  2. NP not pregnant, P pregnant without miscarriage at 10 weeks of gestation, NS not significant, NT not tested