condition mean min max ZT0-3 24.95 24.95 24.95 ZT4-7 19.5 19.5 19.5 ZT8-11 17.45 17.45 17.45 ZT12-15 5.75 5.75 5.75 ZT16-19 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT20-23 26.05 26.05 26.05