condition mean min max ZT0-3 4.3 4.3 4.3 ZT4-7 3.1 3.1 3.1 ZT8-11 3.9000000000000004 3.9000000000000004 3.9000000000000004 ZT12-15 3.7 3.7 3.7 ZT16-19 10.45 10.45 10.45 ZT20-23 5.35 5.35 5.35