condition mean min max ZT0-3 8.95 8.95 8.95 ZT4-7 2.9 2.9 2.9 ZT8-11 7.199999999999999 7.199999999999999 7.199999999999999 ZT12-15 4.25 4.25 4.25 ZT16-19 4.75 4.75 4.75 ZT20-23 7.199999999999999 7.199999999999999 7.199999999999999