condition mean min max ZT0-3 2.34711 1.055915 3.638305 ZT4-7 0.53699 0.53699 0.53699 ZT8-11 1.042805 1.042805 1.042805 ZT12-15 0 0 0 ZT16-19 1.55484 1.55484 1.55484 ZT20-23 3.123025 3.123025 3.123025