condition mean min max ZT0-3 73.3470390425 68.06604806 78.628030025 ZT4-7 41.969352040000004 34.315542655 49.623161425 ZT8-11 19.9334286125 14.50711869 25.359738534999998 ZT12-15 4.16351361175 3.7992340900000006 4.5277931335 ZT16-19 11.590203219 9.689830138 13.4905763 ZT20-23 11.2127564615 9.623094478 12.802418445