Table 3 Multilevel, linear mixed model of the relationship between menstrual phase and sleeping WST, controlling for all significant covariates
Unstandardized b-coefficientS.E.M.
Intercept36.290.34
Cycle phase
MenstrualReferenceReference
Follicular−0.010.03
Fertile−0.11§0.01
Early-luteal0.25§0.02
Late-luteal0.38§0.03
Meal1
Small or no foodReferenceReference
Medium-sized−0.02*0.01
Large−0.04§0.01
Body mass index (kg/m2)−0.05§0.01
Sexual intercourse1−0.02†0.01
Alcohol1
No alcoholReferenceReference
1–4 units0.010.01
≥5 units0.07§0.02
  • *, †, § refer to P<0.10, 0.05, 0.001, respectively.

  • 1 Within 3 h preceding the onset of sleep.