condition mean min max ZT0-3 22.93852214 19.9593341 25.91771018 ZT4-7 16.097334070000002 16.03053898 16.16412916 ZT8-11 17.2383101675 16.847407495 17.62921284 ZT12-15 10.287364029 8.8493279645 11.725400093500001 ZT16-19 6.8924538040000005 6.1697836420000005 7.6151239660000005 ZT20-23 7.905877180499999 7.6703508949999994 8.141403466