condition mean min max ZT0-3 28.727275 28.70355 28.750999999999998 ZT4-7 56.5021 56.5021 56.5021 ZT8-11 50.34795 50.34795 50.34795 ZT12-15 0 0 0 ZT16-19 36.9172 36.9172 36.9172 ZT20-23 31.503999999999998 31.503999999999998 31.503999999999998