condition mean min max ZT0-3 0.024814376 0.0 0.049628752 ZT4-7 0.0111685105 0.0 0.022337021 ZT8-11 0.010595079166666667 0.0 0.021190158333333334 ZT12-15 0.03082327666666667 0.019928831999999997 0.04171772133333334 ZT16-19 0.017812624000000003 0.0 0.035625248000000005 ZT20-23 0.028369566 0.021402436 0.035336696