condition mean min max ZT0-3 10.1 10.1 10.1 ZT4-7 15.2 15.2 15.2 ZT8-11 12.950000000000001 12.950000000000001 12.950000000000001 ZT12-15 4.5 4.5 4.5 ZT16-19 1.15 1.15 1.15 ZT20-23 3.65 3.65 3.65