condition mean min max ZT0-3 33.849725 33.1823 34.51715 ZT4-7 46.76325 46.76325 46.76325 ZT8-11 45.2124 45.2124 45.2124 ZT12-15 0 0 0 ZT16-19 34.26415 34.26415 34.26415 ZT20-23 22.170749999999998 22.170749999999998 22.170749999999998