condition mean min max ZT0-3 0.5675971666666667 0.213944 0.8310085 ZT4-7 0.2779065 0.2779065 0.2779065 ZT8-11 0.1805165 0.1805165 0.1805165 ZT12-15 0.62940825 0.604365 0.6544515 ZT16-19 0.9155405000000001 0.9155405000000001 0.9155405000000001 ZT20-23 1.0320385 1.0320385 1.0320385