condition mean min max ZT0-3 13.6110795175 10.194972945 17.02718609 ZT4-7 18.204715845 15.01661455 21.39281714 ZT8-11 19.178477857 15.829032007333334 22.527923706666666 ZT12-15 18.162950299000002 15.531997231333333 20.79390336666667 ZT16-19 25.632614645 21.94175449 29.3234748 ZT20-23 24.046614093333332 23.30867543 24.784552756666667