Must score calculated over a 3 month period instead of 6 month period

It would be helpful for the Must score to be created on a 3 month basis instead of 6 month as the community dietitians only want a 3 month overview and currently i can give a 3 month overview on their weight loss/gain however their MUST will not match the PCS records as it is worked out on a 6 month period so then we will have to work out each individuals MUST score from a 3 month period creating extra work.