condition mean min max ZT0-3 19.24375 19.24375 19.24375 ZT4-7 17.52525 17.52525 17.52525 ZT8-11 13.58825 13.58825 13.58825 ZT12-15 17.44725 17.44725 17.44725 ZT16-19 22.517049999999998 22.517049999999998 22.517049999999998 ZT20-23 20.84525 20.84525 20.84525