condition mean min max ZT0-3 1.45 1.45 1.45 ZT4-7 8.2 8.2 8.2 ZT8-11 13.950000000000001 13.950000000000001 13.950000000000001 ZT12-15 21.15 21.15 21.15 ZT16-19 0.85 0.85 0.85 ZT20-23 0.9 0.9 0.9