condition mean min max ZT0-3 14.478033333333334 13.98535 15.173 ZT4-7 13.216149999999999 13.216149999999999 13.216149999999999 ZT8-11 13.888449999999999 13.888449999999999 13.888449999999999 ZT12-15 17.82735 17.67405 17.980649999999997 ZT16-19 15.49185 15.49185 15.49185 ZT20-23 19.817149999999998 19.817149999999998 19.817149999999998