condition mean min max ZT0-3 1.022687738 1.01942903 1.0259464459999998 ZT4-7 1.39685110275 1.1422774565 1.6514247489999998 ZT8-11 2.98149771625 2.0541341625 3.9088612699999996 ZT12-15 3.52596146325 3.19025341 3.8616695165 ZT16-19 1.1912523935000001 0.9913733389999999 1.391131448 ZT20-23 1.098789613 1.074768375 1.1228108509999999