condition mean min max ZT0-3 69.95 69.95 69.95 ZT4-7 34.4 34.4 34.4 ZT8-11 22.55 22.55 22.55 ZT12-15 88.9 88.9 88.9 ZT16-19 120.25 120.25 120.25 ZT20-23 40.75 40.75 40.75