condition mean min max ZT0-3 1.098050688 1.094627935 1.101473441 ZT4-7 10.203420179 5.948962428 14.45787793 ZT8-11 16.981264255 14.79542377 19.16710474 ZT12-15 16.812677612499996 16.466403885 17.158951339999998 ZT16-19 15.152332885 14.59817452 15.70649125 ZT20-23 10.07291655275 6.6145453805 13.531287725