condition mean min max ZT0-3 18.0162948225 13.50593962 22.526650025000002 ZT4-7 17.668724967499998 16.68929206 18.648157875 ZT8-11 9.452839799 6.7617607755 12.1439188225 ZT12-15 1.08738215925 0.6039299149999999 1.5708344035 ZT16-19 0.545124596 0.4132003475 0.6770488445 ZT20-23 0.32515090125 0.2502439615 0.40005784099999997