condition mean min max ZT0-3 0.61203125 0.5359695 0.6880930000000001 ZT4-7 0.9097405 0.9097405 0.9097405 ZT8-11 4.0504299999999995 4.0504299999999995 4.0504299999999995 ZT12-15 0 0 0 ZT16-19 2.842795 2.842795 2.842795 ZT20-23 1.436625 1.436625 1.436625