condition mean min max ZT0-3 8.724020000000001 8.724020000000001 8.724020000000001 ZT4-7 5.200095 5.200095 5.200095 ZT8-11 6.812485 6.812485 6.812485 ZT12-15 5.65954 5.65954 5.65954 ZT16-19 12.29661 12.29661 12.29661 ZT20-23 15.002 15.002 15.002