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Table 1 Clinical characteristics of the study population

From: Reference intervals of gestational sac, yolk sac, embryonic length, embryonic heart rate at 6–10 weeks after in vitro fertilization-embryo transfer

Parameter Value
Patients (n) 30,416
Age (years) 30.4 ± 4.4
BMI (kg/m2) 21.8 ± 2.8
Infertility duration (years) 4.8 ± 3.4
Transfer cycle (n) 1.2 ± 0.6
Infertility type
 Primary 13,971 (45.9%)
 Secondary 16,445 (54.1%)
Cause of infertility
 Male 2513 (8.3%)
 Female 17,946 (59.0%)
 Combined female and male factors 8859 (29.1%)
 Unexplained 1098 (3.6%)
Insemination methods
 IVF 14,445 (47.5%)
 ICSI 5723 (18.8%)
 IVF/ICSI 10,213 (33.6%)
 PGD 35 (0.1%)
Embryo type
 Fresh 20,168 (66.3%)
 Frozen 10,248 (33.7%)
Mode of delivery
 Spontaneous delivery 8165 (26.8%)
 Caesarean section 22,251 (73.2%)
 Birth weight (g) 3350.0 ± 240.0
 5th centile 2550.0
 50th centile 3350.0
 95th centile 4100.0
  1. Data are presented as n (%) or the mean ± SD
  2. BMI body mass index, IVF in vitro fertilization, ICSI intracytoplasmic sperm injection, IVF/ICSI refers to either IVF or ICSI performed, PGD preimplantation genetic diagnosis (refers to PGT-M)