condition mean min max ZT0-3 0.5531391666666667 0.5106185000000001 0.6260265 ZT4-7 0.2072025 0.2072025 0.2072025 ZT8-11 0.561214 0.561214 0.561214 ZT12-15 0.38318674999999996 0.38203 0.38434349999999995 ZT16-19 0.393617 0.393617 0.393617 ZT20-23 1.21513 1.21513 1.21513