condition mean min max ZT0-3 12.350375 12.0036 12.69715 ZT4-7 9.86821 9.86821 9.86821 ZT8-11 9.13337 9.13337 9.13337 ZT12-15 0 0 0 ZT16-19 12.9102 12.9102 12.9102 ZT20-23 12.7621 12.7621 12.7621