condition mean min max ZT0-3 58.449512 58.449512 58.449512 ZT4-7 63.349022 63.349022 63.349022 ZT8-11 76.0026405 76.0026405 76.0026405 ZT12-15 71.66115500000001 71.66115500000001 71.66115500000001 ZT16-19 71.8061165 71.8061165 71.8061165 ZT20-23 89.8621855 89.8621855 89.8621855