condition mean min max ZT0-3 41.82918333333333 38.19915 44.409499999999994 ZT4-7 24.48755 24.48755 24.48755 ZT8-11 15.8476 15.8476 15.8476 ZT12-15 23.140275000000003 21.16495 25.1156 ZT16-19 25.520400000000002 25.520400000000002 25.520400000000002 ZT20-23 38.7115 38.7115 38.7115