Describing the status of reproductive ageing simply and precisely: A reproductive ageing score based on three questions and validated with hormone levels
Fig 2
Approximated function for menstrual regularity.
Data points: Inverse proportion of women with regular menstruation for every response to the number of periods during the last year, observed in the RHINE dataset 1-P(period); Line: biquadratic exponential function μA with best fit to observed values 1-P(period).