condition mean min max ZT0-3 14.088605000000001 6.049110000000001 22.1281 ZT4-7 9.69887 9.69887 9.69887 ZT8-11 2.77003 2.77003 2.77003 ZT12-15 5.612191666666667 3.2245933333333334 7.999790000000001 ZT16-19 4.7857199999999995 4.21919 5.35225 ZT20-23 0 0 0