condition mean min max ZT0-3 3.4561925000000002 2.686385 4.226 ZT4-7 1.481285 1.481285 1.481285 ZT8-11 13.93905 13.93905 13.93905 ZT12-15 0 0 0 ZT16-19 44.218 44.218 44.218 ZT20-23 23.1694 23.1694 23.1694