condition mean min max ZT0-3 1345.843133875 1231.0217667499999 1460.664501 ZT4-7 337.50453904999995 321.67164245 353.33743565 ZT8-11 640.786285425 465.2976999 816.2748709499999 ZT12-15 255.3008181025 20.443226465000002 490.15840973999997 ZT16-19 14.157971775 12.08586536 16.23007819 ZT20-23 10.0437972525 9.307401819999999 10.780192685