condition mean min max ZT0-3 6.05 6.05 6.05 ZT4-7 6.7 6.7 6.7 ZT8-11 13.05 13.05 13.05 ZT12-15 27.85 27.85 27.85 ZT16-19 2.2 2.2 2.2 ZT20-23 9.2 9.2 9.2