condition mean min max ZT0-3 13.75 13.75 13.75 ZT4-7 29.9 29.9 29.9 ZT8-11 4.9 4.9 4.9 ZT12-15 42.05 42.05 42.05 ZT16-19 30.15 30.15 30.15 ZT20-23 19.35 19.35 19.35