condition mean min max ZT0-3 21.55 21.55 21.55 ZT4-7 2.7 2.7 2.7 ZT8-11 17.95 17.95 17.95 ZT12-15 3.25 3.25 3.25 ZT16-19 3.75 3.75 3.75 ZT20-23 9.200000000000001 9.200000000000001 9.200000000000001