condition mean min max ZT0-3 10.05 10.05 10.05 ZT4-7 4.1 4.1 4.1 ZT8-11 3.6 3.6 3.6 ZT12-15 13.55 13.55 13.55 ZT16-19 10.85 10.85 10.85 ZT20-23 33.75 33.75 33.75