condition mean min max ZT0-3 594.074023 594.074023 594.074023 ZT4-7 510.97963949999996 510.97963949999996 510.97963949999996 ZT8-11 501.19359499999996 501.19359499999996 501.19359499999996 ZT12-15 748.432103 748.432103 748.432103 ZT16-19 622.0012875 622.0012875 622.0012875 ZT20-23 682.77998 682.77998 682.77998