condition mean min max ZT0-3 590.556891 590.556891 590.556891 ZT4-7 751.8149145 751.8149145 751.8149145 ZT8-11 825.4446685 825.4446685 825.4446685 ZT12-15 628.312342 628.312342 628.312342 ZT16-19 722.183865 722.183865 722.183865 ZT20-23 717.0594490000001 717.0594490000001 717.0594490000001