condition mean min max ZT0-3 1.7484775 1.69417 1.802785 ZT4-7 1.1022615 1.1022615 1.1022615 ZT8-11 0.455274 0.455274 0.455274 ZT12-15 0 0 0 ZT16-19 1.03529 1.03529 1.03529 ZT20-23 1.493475 1.493475 1.493475