condition mean min max ZT0-3 16.520175 14.46165 18.578699999999998 ZT4-7 4.86741 4.86741 4.86741 ZT8-11 2.5890250000000004 2.5890250000000004 2.5890250000000004 ZT12-15 0 0 0 ZT16-19 4.580475 4.580475 4.580475 ZT20-23 7.6547149999999995 7.6547149999999995 7.6547149999999995