Table 2 Clinical characteristics of all women in the study

Age (years)

31.00 ± 4.31

29.81 ± 3.71

30.92 ± 4.48

Parity

0^a

0^a

1^b

Cycle length (days)

29.98 ± 1.32

31.01 ± 1.41

30.10 ± 1.20

Progesterone level (nmol/l)

50.34 ± 2.59

51.67 ± 2.37

52.10 ± 3.02

Timing of sampling (days)

21.07 ± 1.60

20.97 ± 1.98

21.45 ± 1.35

Histroy of infertility (years)

2.85 ± 2.23

3.27 ± 2.60

0