condition mean min max ZT0-3 863.3499999999999 863.3499999999999 863.3499999999999 ZT4-7 578.8 578.8 578.8 ZT8-11 440.20000000000005 440.20000000000005 440.20000000000005 ZT12-15 626.85 626.85 626.85 ZT16-19 837.05 837.05 837.05 ZT20-23 955.75 955.75 955.75