condition mean min max ZT0-3 0.27780083333333333 0.24903350000000002 0.3065365 ZT4-7 0.2124655 0.2124655 0.2124655 ZT8-11 0.10862530000000001 0.10862530000000001 0.10862530000000001 ZT12-15 0.49315299999999995 0.3924935 0.5938125 ZT16-19 0.5681475 0.5681475 0.5681475 ZT20-23 0.643024 0.643024 0.643024