condition mean min max ZT0-3 2.17203908175 1.544113628 2.7999645355 ZT4-7 2.901664159 2.5494715725 3.2538567455000003 ZT8-11 2.8892017927499998 2.7319263245 3.0464772609999997 ZT12-15 4.577829952 2.7811908300000003 6.374469073999999 ZT16-19 4.84446595875 3.993215181 5.6957167365 ZT20-23 9.647763325 8.784351585 10.511175065