condition mean min max ZT0-3 28.11805 28.11805 28.11805 ZT4-7 16.60485 16.60485 16.60485 ZT8-11 10.79015 10.79015 10.79015 ZT12-15 15.298449999999999 15.298449999999999 15.298449999999999 ZT16-19 23.374000000000002 23.374000000000002 23.374000000000002 ZT20-23 30.35815 30.35815 30.35815