condition mean min max ZT0-3 0.85 0.85 0.85 ZT4-7 0.5 0.5 0.5 ZT8-11 13.45 13.45 13.45 ZT12-15 1.4500000000000002 1.4500000000000002 1.4500000000000002 ZT16-19 4.15 4.15 4.15 ZT20-23 1.45 1.45 1.45