condition mean min max ZT0-3 20.83125 20.83125 20.83125 ZT4-7 14.493 14.493 14.493 ZT8-11 17.78625 17.78625 17.78625 ZT12-15 19.31645 19.31645 19.31645 ZT16-19 22.699350000000003 22.699350000000003 22.699350000000003 ZT20-23 20.78935 20.78935 20.78935