condition mean min max ZT0-3 2.13733 1.846995 2.4276649999999997 ZT4-7 2.4032299999999998 2.4032299999999998 2.4032299999999998 ZT8-11 3.688815 3.688815 3.688815 ZT12-15 0 0 0 ZT16-19 3.653135 3.653135 3.653135 ZT20-23 3.236155 3.236155 3.236155