condition mean min max ZT0-3 57.152345 57.152345 57.152345 ZT4-7 143.785807 143.785807 143.785807 ZT8-11 130.85431549999998 130.85431549999998 130.85431549999998 ZT12-15 122.8669115 122.8669115 122.8669115 ZT16-19 84.10447400000001 84.10447400000001 84.10447400000001 ZT20-23 51.774525499999996 51.774525499999996 51.774525499999996