condition mean min max ZT0-3 0.64048825 0.6267895 0.654187 ZT4-7 0.6276865 0.6276865 0.6276865 ZT8-11 0.9836195 0.9836195 0.9836195 ZT12-15 0 0 0 ZT16-19 1.270655 1.270655 1.270655 ZT20-23 0.8521734999999999 0.8521734999999999 0.8521734999999999