condition mean min max ZT0-3 1.121832 1.121832 1.121832 ZT4-7 1.176747 1.176747 1.176747 ZT8-11 1.0008095 1.0008095 1.0008095 ZT12-15 1.459565 1.459565 1.459565 ZT16-19 3.2180999999999997 3.2180999999999997 3.2180999999999997 ZT20-23 2.991765 2.991765 2.991765