condition mean min max ZT0-3 26.1 26.1 26.1 ZT4-7 1.9 1.9 1.9 ZT8-11 10.2 10.2 10.2 ZT12-15 12.3 12.3 12.3 ZT16-19 26.65 26.65 26.65 ZT20-23 4.05 4.05 4.05