condition mean min max ZT0-3 38.497980625 30.236381039999998 46.75958021 ZT4-7 18.682707792499997 18.160262385 19.205153199999998 ZT8-11 11.190569134250001 8.5727233235 13.808414945 ZT12-15 12.703137291250002 9.1577001575 16.248574425 ZT16-19 27.8544942525 23.929764765 31.77922374 ZT20-23 42.2764739 37.272177965 47.280769835