condition mean min max ZT0-3 1.05423825 0.8918965 1.21658 ZT4-7 2.3527649999999998 2.3527649999999998 2.3527649999999998 ZT8-11 0.978901 0.978901 0.978901 ZT12-15 0 0 0 ZT16-19 1.852745 1.852745 1.852745 ZT20-23 1.672495 1.672495 1.672495