condition mean min max ZT0-3 2281.3500000000004 2281.3500000000004 2281.3500000000004 ZT4-7 2306.6 2306.6 2306.6 ZT8-11 2387.3 2387.3 2387.3 ZT12-15 2126.55 2126.55 2126.55 ZT16-19 2445.6000000000004 2445.6000000000004 2445.6000000000004 ZT20-23 2796.75 2796.75 2796.75