condition mean min max ZT0-3 14.8577 8.20935 19.34705 ZT4-7 2.008195 2.008195 2.008195 ZT8-11 27.440649999999998 27.440649999999998 27.440649999999998 ZT12-15 43.886300000000006 31.1843 56.588300000000004 ZT16-19 32.1008 32.1008 32.1008 ZT20-23 40.6563 40.6563 40.6563