condition mean min max ZT0-3 45.409083333333335 32.98735 61.858850000000004 ZT4-7 66.69964999999999 66.69964999999999 66.69964999999999 ZT8-11 39.493550000000006 39.493550000000006 39.493550000000006 ZT12-15 67.79985 44.4215 91.1782 ZT16-19 33.898250000000004 33.898250000000004 33.898250000000004 ZT20-23 77.3308 77.3308 77.3308