condition mean min max ZT0-3 2.9499999999999997 2.9499999999999997 2.9499999999999997 ZT4-7 1.3 1.3 1.3 ZT8-11 10.95 10.95 10.95 ZT12-15 1.0 1.0 1.0 ZT16-19 15.05 15.05 15.05 ZT20-23 1.9 1.9 1.9