condition mean min max ZT0-3 74.703475 69.9479 79.45905 ZT4-7 40.56195 40.56195 40.56195 ZT8-11 18.37885 18.37885 18.37885 ZT12-15 0 0 0 ZT16-19 44.32125 44.32125 44.32125 ZT20-23 63.714150000000004 63.714150000000004 63.714150000000004