condition mean min max ZT0-3 0.637736455 0.09866352 1.17680939 ZT4-7 2.2815784485000004 2.0434580235000004 2.5196988735000003 ZT8-11 3.34112891825 2.53073496 4.1515228765 ZT12-15 4.33210900875 3.6051902525 5.059027765 ZT16-19 3.7789218665 3.5960568775 3.9617868554999998 ZT20-23 4.88476322725 4.7073600885 5.062166366