condition mean min max ZT0-3 69.0994795375 67.838630935 70.36032814 ZT4-7 58.2177370725 52.921102995 63.51437115 ZT8-11 70.97989731999999 63.340323295000005 78.619471345 ZT12-15 77.58435657 75.50052423 79.66818891 ZT16-19 71.3612110775 71.22329785 71.49912430500001 ZT20-23 65.732235255 61.822252965000004 69.642217545