Table 1. Descriptive Statistics of Research Sample.

Variable	No.	Minimum	Maximum	Mean ± SD
Age, y	437	18.00	39.00	27.42 ± 4.45
Gravidity	444	1.00	7.00	2.13 ± 1.20
Parity	439	0.00	5.00	1.34 ± 1.11
BMI	423	23.00	25.20	24.34 ± 0.56
Endometrial thickness (one day before ovulation, mm)	444	7.20	11.70	9.80 ± 0.80
Endometrial thickness (5-7 days after ovulation, mm)	444	6.10	12.80	10.13 ± 1.17
Estradiol, pg/m	412	23.90	415.00	169.40 ± 64.05
Progesterone , mg/ml	419	0.20	50.00	7.31 ± 6.90