Fig. 2: Population-Level GAMM of RMSSD HRV offset and RHR offset during the menstrual cycle.

The partial dependence plot of the day of the menstrual cycle (D) from the population-level GAMM modeling the offset from the cycle-mean RHR and RMSSD in the naturally cycling cohort. Adjusted models are represented by the black dashed line, unadjusted models by the grey dotted line. The) models for RHR offset values are displayed in (a), models for RMSSD offset are displayed in (b). A red dashed line indicates the mean end of menstrual bleeding. Boundary lines indicate the 95% CI for estimates.