condition mean min max ZT0-3 36.65 36.65 36.65 ZT4-7 45.3 45.3 45.3 ZT8-11 33.05 33.05 33.05 ZT12-15 23.9 23.9 23.9 ZT16-19 9.75 9.75 9.75 ZT20-23 29.55 29.55 29.55