condition mean min max ZT0-3 89.665938 89.665938 89.665938 ZT4-7 152.4899855 152.4899855 152.4899855 ZT8-11 118.241353 118.241353 118.241353 ZT12-15 101.5658505 101.5658505 101.5658505 ZT16-19 85.49375649999999 85.49375649999999 85.49375649999999 ZT20-23 105.571009 105.571009 105.571009