condition mean min max ZT0-3 5.9756149999999995 5.9756149999999995 5.9756149999999995 ZT4-7 4.289619999999999 4.289619999999999 4.289619999999999 ZT8-11 5.038155 5.038155 5.038155 ZT12-15 6.067805 6.067805 6.067805 ZT16-19 8.052495 8.052495 8.052495 ZT20-23 6.170170000000001 6.170170000000001 6.170170000000001