condition mean min max ZT0-3 29.6978 26.3142 33.0814 ZT4-7 16.6867 16.6867 16.6867 ZT8-11 14.99815 14.99815 14.99815 ZT12-15 0 0 0 ZT16-19 21.359499999999997 21.359499999999997 21.359499999999997 ZT20-23 27.88325 27.88325 27.88325