condition mean min max ZT0-3 514.106719 514.106719 514.106719 ZT4-7 524.020809 524.020809 524.020809 ZT8-11 663.1551334999999 663.1551334999999 663.1551334999999 ZT12-15 531.5106724999999 531.5106724999999 531.5106724999999 ZT16-19 487.38703250000003 487.38703250000003 487.38703250000003 ZT20-23 521.5711585 521.5711585 521.5711585