condition mean min max ZT0-3 3.4000000000000004 3.4000000000000004 3.4000000000000004 ZT4-7 1.4 1.4 1.4 ZT8-11 3.1500000000000004 3.1500000000000004 3.1500000000000004 ZT12-15 5.9 5.9 5.9 ZT16-19 5.65 5.65 5.65 ZT20-23 3.25 3.25 3.25