condition mean min max ZT0-3 1.7317534445 1.330204938 2.133301951 ZT4-7 1.5368822375000002 1.5154169515000002 1.5583475235000002 ZT8-11 3.2168430984999996 2.0498023995 4.383883797499999 ZT12-15 4.0825603375 3.8889420470000005 4.276178628 ZT16-19 2.96999682775 2.8672996865 3.072693969 ZT20-23 4.0267519935 3.2821104045 4.7713935825