condition mean min max ZT0-3 16.5798 15.544799999999999 17.7617 ZT4-7 11.505055 11.505055 11.505055 ZT8-11 11.78895 11.78895 11.78895 ZT12-15 18.469299999999997 16.12635 20.81225 ZT16-19 18.4695 18.4695 18.4695 ZT20-23 21.716450000000002 21.716450000000002 21.716450000000002