condition mean min max ZT0-3 160.994796 160.994796 160.994796 ZT4-7 106.980421 106.980421 106.980421 ZT8-11 221.24861399999998 221.24861399999998 221.24861399999998 ZT12-15 194.376062 194.376062 194.376062 ZT16-19 254.06101900000002 254.06101900000002 254.06101900000002 ZT20-23 254.4661715 254.4661715 254.4661715