condition mean min max ZT0-3 1.391673338 1.242922687 1.540423989 ZT4-7 21.75911759375 9.8631501375 33.65508505 ZT8-11 74.67241179999999 68.756774905 80.588048695 ZT12-15 57.770972315 46.444468755 69.097475875 ZT16-19 26.808210957500002 21.55016942 32.066252495 ZT20-23 16.3192318375 15.68307707 16.955386605