condition mean min max ZT0-3 1.2863185000000001 1.2863185000000001 1.2863185000000001 ZT4-7 0.9763919999999999 0.9763919999999999 0.9763919999999999 ZT8-11 0.735026 0.735026 0.735026 ZT12-15 0.0 0.0 0.0 ZT16-19 1.4464700000000001 1.4464700000000001 1.4464700000000001 ZT20-23 2.14525 2.14525 2.14525