condition mean min max ZT0-3 3.05 3.05 3.05 ZT4-7 5.6 5.6 5.6 ZT8-11 14.5 14.5 14.5 ZT12-15 3.05 3.05 3.05 ZT16-19 4.75 4.75 4.75 ZT20-23 19.25 19.25 19.25