condition mean min max ZT0-3 3.6356150000000005 2.974325 4.296905000000001 ZT4-7 3.9884700000000004 3.9884700000000004 3.9884700000000004 ZT8-11 4.56356 4.56356 4.56356 ZT12-15 0 0 0 ZT16-19 5.511835 5.511835 5.511835 ZT20-23 5.107535 5.107535 5.107535