condition mean min max ZT0-3 0.8922968333333333 0.8458085 0.9231659999999999 ZT4-7 0.600786 0.600786 0.600786 ZT8-11 1.304589 1.304589 1.304589 ZT12-15 1.4120274999999998 1.222945 1.6011099999999998 ZT16-19 1.48822 1.48822 1.48822 ZT20-23 0.9948665 0.9948665 0.9948665