condition mean min max ZT0-3 0.3768901666666667 0.0 0.8428305 ZT4-7 0.3496265 0.3496265 0.3496265 ZT8-11 0.428374 0.428374 0.428374 ZT12-15 0.46704975 0.4366675 0.497432 ZT16-19 0.5768789999999999 0.5768789999999999 0.5768789999999999 ZT20-23 0.351117 0.351117 0.351117