condition mean min max ZT0-3 1.6870574999999999 1.423635 1.95048 ZT4-7 2.2945349999999998 2.2945349999999998 2.2945349999999998 ZT8-11 4.421725 4.421725 4.421725 ZT12-15 0 0 0 ZT16-19 6.74891 6.74891 6.74891 ZT20-23 3.184905 3.184905 3.184905