condition mean min max ZT0-3 6.65561646125 5.8884644765 7.422768446 ZT4-7 1.9071993525000002 1.5130705135 2.3013281915 ZT8-11 2.21831366075 1.8154320595 2.6211952619999996 ZT12-15 4.1948109670000004 2.723034791 5.666587143 ZT16-19 4.5798412145 4.5759279695 4.5837544595 ZT20-23 5.8626831159999995 5.429947 6.2954192319999995