condition mean min max ZT0-3 2.96712868875 1.160666686 4.7735906915 ZT4-7 8.136690869999999 8.1314138295 8.1419679105 ZT8-11 6.3300897549999995 5.3836053985 7.2765741114999996 ZT12-15 22.788059562 19.135471474 26.440647650000002 ZT16-19 29.7299071525 25.950706520000004 33.509107785 ZT20-23 21.480373855 18.593698789999998 24.367048920000002