condition mean min max ZT0-3 821.7 821.7 821.7 ZT4-7 1296.7 1296.7 1296.7 ZT8-11 1111.65 1111.65 1111.65 ZT12-15 1016.95 1016.95 1016.95 ZT16-19 877.0999999999999 877.0999999999999 877.0999999999999 ZT20-23 774.25 774.25 774.25