condition mean min max ZT0-3 2.74111405475 2.2986851985 3.1835429110000004 ZT4-7 4.54130708975 3.243823491 5.8387906885 ZT8-11 10.366492157749999 9.4323114005 11.300672915 ZT12-15 7.89012027 7.192959083 8.587281457 ZT16-19 12.563291702250002 11.9682602545 13.158323150000001 ZT20-23 10.534992563000001 10.162918731000001 10.907066395000001