condition mean min max ZT0-3 5.1000000000000005 5.1000000000000005 5.1000000000000005 ZT4-7 1.3 1.3 1.3 ZT8-11 12.6 12.6 12.6 ZT12-15 2.35 2.35 2.35 ZT16-19 12.0 12.0 12.0 ZT20-23 3.65 3.65 3.65