condition mean min max ZT0-3 1007.991724 1007.991724 1007.991724 ZT4-7 939.633052 939.633052 939.633052 ZT8-11 773.3683795 773.3683795 773.3683795 ZT12-15 850.854787 850.854787 850.854787 ZT16-19 754.058123 754.058123 754.058123 ZT20-23 701.2216555 701.2216555 701.2216555