condition mean min max ZT0-3 0.5627425 0.4524395 0.7169695 ZT4-7 0.2320825 0.2320825 0.2320825 ZT8-11 0.07941395 0.07941395 0.07941395 ZT12-15 0.27014225000000003 0.24833 0.2919545 ZT16-19 0.45129149999999996 0.45129149999999996 0.45129149999999996 ZT20-23 0.385317 0.385317 0.385317