condition mean min max ZT0-3 226.795967 226.795967 226.795967 ZT4-7 421.96912599999996 421.96912599999996 421.96912599999996 ZT8-11 477.705247 477.705247 477.705247 ZT12-15 359.89569500000005 359.89569500000005 359.89569500000005 ZT16-19 101.5176765 101.5176765 101.5176765 ZT20-23 74.84002749999999 74.84002749999999 74.84002749999999