condition mean min max ZT0-3 15.9 15.9 15.9 ZT4-7 0.5 0.5 0.5 ZT8-11 11.05 11.05 11.05 ZT12-15 3.55 3.55 3.55 ZT16-19 1.65 1.65 1.65 ZT20-23 10.4 10.4 10.4