condition mean min max ZT0-3 73.9123 56.531800000000004 91.2928 ZT4-7 14.13185 14.13185 14.13185 ZT8-11 21.56505 21.56505 21.56505 ZT12-15 0 0 0 ZT16-19 25.2524 25.2524 25.2524 ZT20-23 22.0728 22.0728 22.0728