Table. 1 Demographics of the QCycle cohort, including n values, age, ethnicity, and hormonal cycle characteristics.

From: Ultradian rhythms in heart rate variability and distal body temperature anticipate onset of the luteinizing hormone surge

Factor

Premenopausal

Perimenopausal

Number of participants

20

6

Number of cycles

45

10

Age range, mean (STDEV) years

21–38, 32 (4)

48–60, 55 (5)

Ethnicity (%)

Caucasian: 94; African American 6

Caucasian: 100%

Cycle length

25–36, 27.78 (4.16)

22–50, 28.7 (8.87)

LH surge length range, mean (STDEV) days

1–5,1.95 (1.2)

N/A; LH tonically high

LH surge onset day

10–29, 15.75 (3.4)

N/A; LH tonically high

LH surge onset relative to E2 peak in days

0–4, 1.67, (1.38)

N/A ; LH tonically high

LH surge day relative to progesterone rise day(n = 21)

0–5, 1.14, (1.95)

N/A; LH tonically high

Regular cyclers (%)

88

0

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