condition mean min max ZT0-3 14.678635137499999 13.146950675 16.2103196 ZT4-7 5.57822537475 4.8759171785 6.280533570999999 ZT8-11 6.34796726225 5.5231581875 7.172776337 ZT12-15 6.8773126255 6.411627639 7.3429976120000005 ZT16-19 9.46706373325 8.006652351 10.9274751155 ZT20-23 14.396039779999999 13.80418087 14.98789869