condition mean min max ZT0-3 10.619436286500001 3.387522777 17.851349796 ZT4-7 54.122182355 41.164740835 67.079623875 ZT8-11 67.6442815825 62.686289065 72.6022741 ZT12-15 53.88073122 45.251237509999996 62.51022493000001 ZT16-19 56.9945632875 53.81593816 60.173188415 ZT20-23 69.7420624925 64.11320521 75.370919775