condition mean min max ZT0-3 0.39459316666666666 0.0 0.7051145 ZT4-7 1.470755 1.470755 1.470755 ZT8-11 12.83475 12.83475 12.83475 ZT12-15 8.050239999999999 4.281829999999999 11.81865 ZT16-19 2.7649749999999997 2.7649749999999997 2.7649749999999997 ZT20-23 1.3686500000000001 1.3686500000000001 1.3686500000000001