condition mean min max ZT0-3 12.2 12.2 12.2 ZT4-7 2.0 2.0 2.0 ZT8-11 30.650000000000002 30.650000000000002 30.650000000000002 ZT12-15 4.25 4.25 4.25 ZT16-19 2.3 2.3 2.3 ZT20-23 28.35 28.35 28.35