condition mean min max ZT0-3 0.43456 0.43456 0.43456 ZT4-7 0.72212 0.72212 0.72212 ZT8-11 0.547452 0.547452 0.547452 ZT12-15 0.142909 0.142909 0.142909 ZT16-19 0.923405 0.923405 0.923405 ZT20-23 0.5600525 0.5600525 0.5600525