condition mean min max ZT0-3 11.36476 7.03553 15.749849999999999 ZT4-7 7.302375 7.302375 7.302375 ZT8-11 10.256345 10.256345 10.256345 ZT12-15 18.240949999999998 16.286649999999998 20.19525 ZT16-19 17.0904 17.0904 17.0904 ZT20-23 21.076549999999997 21.076549999999997 21.076549999999997