condition mean min max ZT0-3 2.9000000000000004 2.9000000000000004 2.9000000000000004 ZT4-7 5.3 5.3 5.3 ZT8-11 9.5 9.5 9.5 ZT12-15 3.95 3.95 3.95 ZT16-19 6.15 6.15 6.15 ZT20-23 3.75 3.75 3.75