Table 1 Characteristics of the participants, mean (± SD) or n (%)

Age, y

51.0 (± 2.0)

51.6 (± 1.8)

0.222

Height, cm

163.8 (± 0.1)

164.2 (± 0.1)

0.810

BMI

25.4 (± 4.4)

25.3 (± 3.7)

0.916

FSH (IU/L)

17.32 (± 4.79)

48.25 (± 22.28)

 < 0.001

E2 (nmol/L)

0.374 (± 0.257)

0.249 (± 0.200)

0.035

Mean cycle length

36.8 (± 22.2) ^a

65.8 (± 41.7)^b

0.001

Mean bleeding days

6.0 (± 1.4) ^a

5.3 (± 1.5)^b

0.098

Mean non-bleeding days

34.7 (± 31.6) ^a

65.2 (± 49.1)^b

0.006

Physical activity

0.652

 Low

4 (16)

6 (16)

 Moderate

7 (28)

7 (18)

 High

14 (56)

25 (66)

Stimulus intensity (%)

83.6 (± 7.7)

84.5 (± 9,6)

0.691