condition mean min max ZT0-3 27.85 27.85 27.85 ZT4-7 20.1 20.1 20.1 ZT8-11 54.199999999999996 54.199999999999996 54.199999999999996 ZT12-15 89.65 89.65 89.65 ZT16-19 76.75 76.75 76.75 ZT20-23 18.45 18.45 18.45