In a new study published in the journal Nature Digital Medicine, contraceptive app Natural Cycles analysed data from over 600,000 menstrual cycles and 124,648 women across Sweden, the USA and the UK. From this, it was established that the shorter a woman’s overall cycle, the shorter her period is likely to be.
The research found 'very short cycles' (21 days or less) had shorter bleed lengths by 0.5 days or 12 per cent. 'Very long cycles' (35 days or more) had longer bleed lengths by 0.2 days or 6 per cent.
Worth noting: 65 per cent of all participants’ cycles fell between the 25-30 day range, but only 13 per cent had a 28-day cycle. Instead, the average was more like 29.3 days.
"Women are totally individual," Professor Joyce Harper, Head of Research Department of Reproductive Health at UCL tells Cosmopolitan UK. "Our studies confirm the huge variability women have with their menstrual cycles – from the overall length, the days they bled, and the day they ovulate."