condition mean min max ZT0-3 4.52937 2.66587 5.6164000000000005 ZT4-7 1.97726 1.97726 1.97726 ZT8-11 11.94585 11.94585 11.94585 ZT12-15 10.293064999999999 7.33778 13.248349999999999 ZT16-19 6.06891 6.06891 6.06891 ZT20-23 9.12514 9.12514 9.12514