condition mean min max ZT0-3 24.72075 20.8696 30.485149999999997 ZT4-7 19.6525 19.6525 19.6525 ZT8-11 16.5556 16.5556 16.5556 ZT12-15 29.96635 29.66865 30.26405 ZT16-19 25.0318 25.0318 25.0318 ZT20-23 25.42615 25.42615 25.42615