condition mean min max ZT0-3 3.27887 2.72337 3.83437 ZT4-7 3.070265 3.070265 3.070265 ZT8-11 5.40164 5.40164 5.40164 ZT12-15 0 0 0 ZT16-19 4.790665 4.790665 4.790665 ZT20-23 3.74593 3.74593 3.74593