condition mean min max ZT0-3 5.199999999999999 5.199999999999999 5.199999999999999 ZT4-7 2.1 2.1 2.1 ZT8-11 1.95 1.95 1.95 ZT12-15 5.3 5.3 5.3 ZT16-19 13.6 13.6 13.6 ZT20-23 2.1 2.1 2.1