condition mean min max ZT0-3 0.8545905 0.8545905 0.8545905 ZT4-7 0.44408499999999995 0.44408499999999995 0.44408499999999995 ZT8-11 0.352498 0.352498 0.352498 ZT12-15 0.922587 0.922587 0.922587 ZT16-19 2.28469 2.28469 2.28469 ZT20-23 1.18644 1.18644 1.18644