condition mean min max ZT0-3 3.3544383333333334 2.34732 4.318005 ZT4-7 2.1865595 2.1865595 2.1865595 ZT8-11 3.129265 3.129265 3.129265 ZT12-15 9.0885675 8.463555 9.71358 ZT16-19 5.67436 5.67436 5.67436 ZT20-23 5.59025 5.59025 5.59025