condition mean min max ZT0-3 10.75 10.75 10.75 ZT4-7 44.0 44.0 44.0 ZT8-11 45.25 45.25 45.25 ZT12-15 29.55 29.55 29.55 ZT16-19 28.4 28.4 28.4 ZT20-23 33.7 33.7 33.7