condition mean min max ZT0-3 0.6144146666666667 0.0 1.249212 ZT4-7 0.455579 0.455579 0.455579 ZT8-11 1.448445 1.448445 1.448445 ZT12-15 1.2129889999999999 1.00305 1.422928 ZT16-19 0.843334 0.843334 0.843334 ZT20-23 1.0642225 1.0642225 1.0642225