condition mean min max ZT0-3 1.721345 1.721345 1.721345 ZT4-7 0.600067 0.600067 0.600067 ZT8-11 1.354485 1.354485 1.354485 ZT12-15 1.670235 1.670235 1.670235 ZT16-19 2.128625 2.128625 2.128625 ZT20-23 2.486775 2.486775 2.486775