condition mean min max ZT0-3 457.2092087 359.7018252 554.7165922 ZT4-7 239.25778505000002 230.11725340000004 248.3983167 ZT8-11 113.97152897000001 84.82988349 143.11317445000003 ZT12-15 39.9559732825 38.484367145 41.42757942 ZT16-19 77.01239237749999 65.438844435 88.58594032 ZT20-23 113.28313597249999 111.41378399499999 115.15248795000001