Table 1 Characteristics for participants (n = 22)

Age (years), average (SD), range

34.7 (8.8), 21–49

BMI (kg/m²), average (SD), range

24.3 (3.6), 20.3–37.2^a

 none

11 (50.0)

 non-hormonal

11 (50.0)

  not mentioned /

7 (31.8)

  condom /

3 (13.6)

  copper intra uterine device

1 (4.5)

Regular menstruation, n (%)

19 (86.4)

Underlying diseases, n (%)

4 (18.2)^bb

Continuous medications, n (%)

4 (18.2)^ccc

Smoking, n (%)

0 (0.0)