condition mean min max ZT0-3 1.475002 0.734641 2.374045 ZT4-7 0.6585605 0.6585605 0.6585605 ZT8-11 0.7232084999999999 0.7232084999999999 0.7232084999999999 ZT12-15 1.379454 1.036478 1.72243 ZT16-19 1.996105 1.996105 1.996105 ZT20-23 5.11797 5.11797 5.11797