condition mean min max ZT0-3 3.80662 3.24287 4.37037 ZT4-7 6.36543 6.36543 6.36543 ZT8-11 3.494145 3.494145 3.494145 ZT12-15 0 0 0 ZT16-19 2.650915 2.650915 2.650915 ZT20-23 5.703765 5.703765 5.703765