condition mean min max ZT0-3 206.65 206.65 206.65 ZT4-7 182.6 182.6 182.6 ZT8-11 260.95000000000005 260.95000000000005 260.95000000000005 ZT12-15 156.55 156.55 156.55 ZT16-19 92.75 92.75 92.75 ZT20-23 134.25 134.25 134.25