condition mean min max ZT0-3 10.23255 10.23255 10.23255 ZT4-7 9.36698 9.36698 9.36698 ZT8-11 11.055505 11.055505 11.055505 ZT12-15 5.006635 5.006635 5.006635 ZT16-19 5.835170000000001 5.835170000000001 5.835170000000001 ZT20-23 4.10799 4.10799 4.10799