condition mean min max ZT0-3 4.98201532575 3.0890644425 6.874966209 ZT4-7 4.43231915125 3.1909232579999998 5.6737150445 ZT8-11 6.58662849425 5.9543402284999996 7.218916760000001 ZT12-15 5.6613859922500005 5.1404487525 6.182323232 ZT16-19 11.4144493695 9.6081109575 13.2207877815 ZT20-23 14.76234681 14.439726154999999 15.084967465