condition mean min max ZT0-3 40.404925 36.559 44.25085 ZT4-7 28.1241 28.1241 28.1241 ZT8-11 26.517699999999998 26.517699999999998 26.517699999999998 ZT12-15 0 0 0 ZT16-19 35.39085 35.39085 35.39085 ZT20-23 45.8088 45.8088 45.8088