condition mean min max ZT0-3 10.68530413725 9.509944504499998 11.86066377 ZT4-7 10.228989109 8.634725308 11.82325291 ZT8-11 11.7331191375 11.241923799999999 12.224314475 ZT12-15 11.165489 11.026352365000001 11.304625635 ZT16-19 7.61830473925 7.091829392 8.144780086499999 ZT20-23 16.6631644375 10.47040851 22.855920365000003