condition mean min max ZT0-3 3.65 3.65 3.65 ZT4-7 5.0 5.0 5.0 ZT8-11 2.0 2.0 2.0 ZT12-15 2.25 2.25 2.25 ZT16-19 5.449999999999999 5.449999999999999 5.449999999999999 ZT20-23 3.4000000000000004 3.4000000000000004 3.4000000000000004