condition mean min max ZT0-3 2.61402606325 0.182263907 5.0457882194999994 ZT4-7 36.867218375 19.644273830000003 54.09016292 ZT8-11 61.3019759575 59.492195495000004 63.11175641999999 ZT12-15 15.5128326895 9.573258914 21.452406465 ZT16-19 4.725733654499999 4.442952843 5.008514465999999 ZT20-23 2.8846787217500003 1.9686477 3.8007097435000006