condition mean min max ZT0-3 31.049999999999997 31.049999999999997 31.049999999999997 ZT4-7 0.9 0.9 0.9 ZT8-11 33.95 33.95 33.95 ZT12-15 2.9 2.9 2.9 ZT16-19 4.9 4.9 4.9 ZT20-23 2.4000000000000004 2.4000000000000004 2.4000000000000004