condition mean min max ZT0-3 18.1 18.1 18.1 ZT4-7 14.0 14.0 14.0 ZT8-11 37.55 37.55 37.55 ZT12-15 33.9 33.9 33.9 ZT16-19 25.3 25.3 25.3 ZT20-23 30.35 30.35 30.35