condition mean min max ZT0-3 37.57926666666667 29.4589 45.93945 ZT4-7 30.02195 30.02195 30.02195 ZT8-11 21.70395 21.70395 21.70395 ZT12-15 33.079375 29.9702 36.18855 ZT16-19 34.09665 34.09665 34.09665 ZT20-23 35.4846 35.4846 35.4846