Weeks on 5:2 Mean 12.5, median 10. 12.5 is the mean "average" (total weeks divided by number of fasters) whereas 10 is the median or mid point where half have been on for longer and half for less. Rest of data is also mean, median :-
Initial BMI 30.9, 29.1
BMI after 5:2 29.0, 27.3 (up to submitting questionnaire)
Weekly weight loss kg over 5:2 period 0.51, 0.47 kg
Weekly waist reduction over 5:2 period 0.57, 0.49 cm
Start weight 83.5, 77.5 kg
Close weight 78.4, 73.4 kg
Age 58.8, 59
Waist/height ratio before 0.59, 0.59
W/H ratio after 0.48, 0.52
Number of post menopausal ladies reporting = 62
As young Mr Grace would say, "You're all doing very well"
(UK sitcom reference - Are You Being Served)