condition mean min max ZT0-3 30.916 30.916 30.916 ZT4-7 31.64345 31.64345 31.64345 ZT8-11 27.9952 27.9952 27.9952 ZT12-15 25.83885 25.83885 25.83885 ZT16-19 23.6978 23.6978 23.6978 ZT20-23 26.58115 26.58115 26.58115