condition mean min max ZT0-3 17.284757 17.284757 17.284757 ZT4-7 11.8916775 11.8916775 11.8916775 ZT8-11 13.4248265 13.4248265 13.4248265 ZT12-15 13.291886 13.291886 13.291886 ZT16-19 13.901164 13.901164 13.901164 ZT20-23 14.7444925 14.7444925 14.7444925