condition mean min max ZT0-3 4.39786 4.098125 4.697595 ZT4-7 4.48121 4.48121 4.48121 ZT8-11 8.008855 8.008855 8.008855 ZT12-15 0 0 0 ZT16-19 11.91875 11.91875 11.91875 ZT20-23 11.58795 11.58795 11.58795