condition mean min max ZT0-3 0.59855818925 0.397469686 0.7996466925 ZT4-7 1.21369152175 0.969658697 1.4577243465 ZT8-11 2.7930939097500005 1.8244002140000002 3.7617876055000004 ZT12-15 6.369489622750001 5.083077553 7.6559016925000005 ZT16-19 4.75811014225 4.339046038999999 5.1771742455 ZT20-23 5.71607982475 5.177083157 6.255076492500001