condition mean min max ZT0-3 45.849563 45.849563 45.849563 ZT4-7 57.298679 57.298679 57.298679 ZT8-11 66.2626475 66.2626475 66.2626475 ZT12-15 39.351828499999996 39.351828499999996 39.351828499999996 ZT16-19 19.721605 19.721605 19.721605 ZT20-23 24.7415375 24.7415375 24.7415375