condition mean min max ZT0-3 24.936183333333336 19.50665 30.853 ZT4-7 47.76535 47.76535 47.76535 ZT8-11 16.3222 16.3222 16.3222 ZT12-15 8.7513425 8.266169999999999 9.236515 ZT16-19 16.9814 16.9814 16.9814 ZT20-23 16.22385 16.22385 16.22385