condition mean min max ZT0-3 9.658223333333334 5.71324 12.338750000000001 ZT4-7 6.42958 6.42958 6.42958 ZT8-11 11.17005 11.17005 11.17005 ZT12-15 11.4752425 9.340585 13.6099 ZT16-19 14.5622 14.5622 14.5622 ZT20-23 17.60735 17.60735 17.60735