condition mean min max ZT0-3 25.05 25.05 25.05 ZT4-7 3.9 3.9 3.9 ZT8-11 13.2 13.2 13.2 ZT12-15 7.5 7.5 7.5 ZT16-19 6.25 6.25 6.25 ZT20-23 16.75 16.75 16.75