removed unneeded code, z-scores still slightly off
removed unneeded code, z-scores still slightly off

johanneswilm/eha-nutsurv-django,eHealthAfrica/nutsurv,johanneswilm/eha-nutsurv-django,eHealthAfrica/nutsurv,johanneswilm/eha-nutsurv-django,eHealthAfrica/nutsurv