condition mean min max ZT0-3 71.41043553916667 68.25838013333333 74.56249094500001 ZT4-7 63.32865644 58.651232703333335 68.00608017666667 ZT8-11 53.987344475 48.64827311 59.32641584 ZT12-15 58.96990879166667 56.38790984 61.55190774333333 ZT16-19 51.716823016666666 48.662055450000004 54.771590583333335 ZT20-23 61.927714475 61.186087 62.669341949999996