condition mean min max ZT0-3 4.05 4.05 4.05 ZT4-7 2.6 2.6 2.6 ZT8-11 12.2 12.2 12.2 ZT12-15 26.65 26.65 26.65 ZT16-19 10.2 10.2 10.2 ZT20-23 5.1 5.1 5.1