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. Author manuscript; available in PMC: 2025 Jan 2.
Published in final edited form as: Sleep Epidemiol. 2024 Jul 31;4:100093. doi: 10.1016/j.sleepe.2024.100093

Table 1.

Dimensions of Poor Sleep in Premenopausal Women: The Biocycle Study.

Mean sleep duration, hours/night
 Range 4.4, 10.6
 Mean (SD) 7.2 (0.7)
 Proportion <7 h (%) 36
Variability (dispersion) in sleep duration, hours/night
 Range 0.02, 1.78
 Mean (Median) 0.74 (0.70)
 Proportion <1 h (%) 82
Variability in bedtime
 Range 0.00, 7.8
 Mean (Median) 1.5 (1.5)
 Proportion <2 h (%) 67
Sleep-onset latency on weekdays, minutes (%)
 Range 0, 90
 Mean (SD) 16.7 (12.8)
 Proportion ≥ 30 min (%) 24
Nocturnal awakenings (%)
 Never 46
 ≥ 1 time/night 54

Variability in Sleep duration corresponds to the spread of sleep duration entries below or above woman’s habitual sleep duration; Bedtime variability is defined as ≥2 h difference between weekday and weekend bedtime; Nocturnal awakening is defined as ≥1 awakening per night.