condition mean min max ZT0-3 1.1226322499999999 0.77876 1.4665044999999999 ZT4-7 1.749305 1.749305 1.749305 ZT8-11 3.1138649999999997 3.1138649999999997 3.1138649999999997 ZT12-15 0 0 0 ZT16-19 2.807035 2.807035 2.807035 ZT20-23 2.303935 2.303935 2.303935