condition mean min max ZT0-3 77.55305 69.77705 85.32905 ZT4-7 69.7367 69.7367 69.7367 ZT8-11 94.49035 94.49035 94.49035 ZT12-15 0 0 0 ZT16-19 107.937 107.937 107.937 ZT20-23 71.81335 71.81335 71.81335