condition mean min max ZT0-3 10.888805 10.888805 10.888805 ZT4-7 13.833706 13.833706 13.833706 ZT8-11 12.139369 12.139369 12.139369 ZT12-15 10.8660675 10.8660675 10.8660675 ZT16-19 12.1012655 12.1012655 12.1012655 ZT20-23 10.876642 10.876642 10.876642