condition mean min max ZT0-3 2.64843289375 2.245816163 3.0510496245 ZT4-7 3.60682507 3.5416356110000002 3.672014529 ZT8-11 4.2617335555 3.7889141719999997 4.734552939 ZT12-15 7.38064344375 6.11650403 8.644782857500001 ZT16-19 7.086736084750001 7.0696530255 7.103819144000001 ZT20-23 7.1917247597500005 7.178346418 7.2051031015