condition mean min max ZT0-3 7.759571666666667 3.71196 11.193000000000001 ZT4-7 15.02505 15.02505 15.02505 ZT8-11 34.17885 34.17885 34.17885 ZT12-15 37.4029 33.9349 40.870900000000006 ZT16-19 34.553399999999996 34.553399999999996 34.553399999999996 ZT20-23 31.27155 31.27155 31.27155