condition mean min max ZT0-3 1.4509411666666667 0.9911585 1.95644 ZT4-7 2.155865 2.155865 2.155865 ZT8-11 0.0 0.0 0.0 ZT12-15 1.1091647500000001 1.0991055 1.119224 ZT16-19 0.672815 0.672815 0.672815 ZT20-23 0.47242 0.47242 0.47242