condition mean min max ZT0-3 24.599616666666666 22.7135 26.82845 ZT4-7 21.01575 21.01575 21.01575 ZT8-11 14.2808 14.2808 14.2808 ZT12-15 16.859925 15.85585 17.864 ZT16-19 21.33005 21.33005 21.33005 ZT20-23 25.51165 25.51165 25.51165