condition mean min max ZT0-3 12.0 12.0 12.0 ZT4-7 2.0 2.0 2.0 ZT8-11 10.6 10.6 10.6 ZT12-15 1.25 1.25 1.25 ZT16-19 7.8 7.8 7.8 ZT20-23 2.1500000000000004 2.1500000000000004 2.1500000000000004