condition mean min max ZT0-3 10.023463628 7.880444891000001 12.166482365 ZT4-7 15.874456537499999 13.983256189999999 17.765656885 ZT8-11 19.484431545 15.99024854 22.97861455 ZT12-15 21.71994371 20.95906798 22.480819439999998 ZT16-19 18.328855475 16.22910865 20.4286023 ZT20-23 29.5757058925 23.66565353 35.485758255