condition mean min max ZT0-3 4.48011 4.48011 4.48011 ZT4-7 3.97638 3.97638 3.97638 ZT8-11 2.674905 2.674905 2.674905 ZT12-15 2.74575 2.74575 2.74575 ZT16-19 3.9312 3.9312 3.9312 ZT20-23 5.44649 5.44649 5.44649