condition mean min max ZT0-3 44.9176 37.36295 52.47225 ZT4-7 27.6602 27.6602 27.6602 ZT8-11 35.1557 35.1557 35.1557 ZT12-15 0 0 0 ZT16-19 48.722449999999995 48.722449999999995 48.722449999999995 ZT20-23 47.55245 47.55245 47.55245