condition mean min max ZT0-3 0.56262375 0.56262375 0.56262375 ZT4-7 0.53058225 0.53058225 0.53058225 ZT8-11 0.31558795 0.31558795 0.31558795 ZT12-15 0.38218175 0.38218175 0.38218175 ZT16-19 0.45499924999999997 0.45499924999999997 0.45499924999999997 ZT20-23 0.47536595833333334 0.47536595833333334 0.47536595833333334