condition mean min max ZT0-3 1.35 1.35 1.35 ZT4-7 1.2 1.2 1.2 ZT8-11 2.1500000000000004 2.1500000000000004 2.1500000000000004 ZT12-15 8.9 8.9 8.9 ZT16-19 1.6 1.6 1.6 ZT20-23 31.4 31.4 31.4