condition mean min max ZT0-3 0.05352075 0.0 0.1070415 ZT4-7 0.213686 0.213686 0.213686 ZT8-11 0.64637 0.64637 0.64637 ZT12-15 0 0 0 ZT16-19 0.5864119999999999 0.5864119999999999 0.5864119999999999 ZT20-23 0.32242950000000004 0.32242950000000004 0.32242950000000004