condition mean min max ZT0-3 11.589733333333333 8.161865 16.0613 ZT4-7 9.73284 9.73284 9.73284 ZT8-11 15.5113 15.5113 15.5113 ZT12-15 25.07985 24.502850000000002 25.65685 ZT16-19 29.3191 29.3191 29.3191 ZT20-23 28.9143 28.9143 28.9143