condition mean min max ZT0-3 31.777805915000002 30.80185303 32.7537588 ZT4-7 28.3557384075 24.47366241 32.237814405 ZT8-11 29.58289561 28.957265895 30.208525325 ZT12-15 18.1287610025 16.31764066 19.939881345000003 ZT16-19 28.608438945 27.748464419999998 29.46841347 ZT20-23 21.8240797665 16.270504813 27.37765472