Table 1. Number of embryos for each measurements.

Type of measurements	Gestational Age (Day)	Number of measured embryos
Decidual thickness	E6.5–9.5	95
Gestational sac length	E7.5–11.5	112
Gestational sac thickness	E7.5–11.5	112
Implantation site length	E6.5–E9.5	95
Implantation site thickness	E6.5–E9.5	95
Placental length	E9.5–E16.5	128
Placental thickness	E9.5–E16.5	128
Crown-rump length	E7.5–E14.5	152
Abdominal circumference	E11.5–E16.5	81
Antero-posterior abdominal diameter	E11.5–E16.5	81
Latero-lateral abdominal diameter	E11.5–E16.5	81
Occipital-snout length	E12.5–E16.5	61
Biparietal diameter	E9.5–E16.5	126
Subretinal space thickness	E12.5–E16.5	68
Antero-posterior lens diameter	E12.5–E16.5	68
Latero-lateral lens diameter	E12.5–E16.5	68
Stomach diameter	E12.5–E16.5	59