condition mean min max ZT0-3 50.52730832499999 23.6252395 77.42937715 ZT4-7 134.00480887499998 130.2916612 137.71795655 ZT8-11 111.86755769499999 94.28669869 129.4484167 ZT12-15 81.34271258 70.185410015 92.50001514499999 ZT16-19 96.39489954749999 81.344980295 111.4448188 ZT20-23 43.9543802775 34.715862779999995 53.192897775000006