condition mean min max ZT0-3 0.5437775 0.519755 0.5678 ZT4-7 0.3253765 0.3253765 0.3253765 ZT8-11 0.25460745 0.25460745 0.25460745 ZT12-15 0 0 0 ZT16-19 0.052814599999999996 0.052814599999999996 0.052814599999999996 ZT20-23 0.3186935 0.3186935 0.3186935