condition mean min max ZT0-3 398.011392 398.011392 398.011392 ZT4-7 529.711708 529.711708 529.711708 ZT8-11 986.1222635 986.1222635 986.1222635 ZT12-15 617.5145725 617.5145725 617.5145725 ZT16-19 402.38159199999996 402.38159199999996 402.38159199999996 ZT20-23 250.67714 250.67714 250.67714