condition mean min max ZT0-3 24.6 24.6 24.6 ZT4-7 2.3 2.3 2.3 ZT8-11 7.199999999999999 7.199999999999999 7.199999999999999 ZT12-15 1.9 1.9 1.9 ZT16-19 15.95 15.95 15.95 ZT20-23 2.2 2.2 2.2