condition mean min max ZT0-3 40.099999999999994 40.099999999999994 40.099999999999994 ZT4-7 23.5 23.5 23.5 ZT8-11 22.95 22.95 22.95 ZT12-15 35.95 35.95 35.95 ZT16-19 49.949999999999996 49.949999999999996 49.949999999999996 ZT20-23 15.049999999999999 15.049999999999999 15.049999999999999