condition mean min max ZT0-3 61.777447675000005 51.17903698 72.37585837 ZT4-7 29.6823266 28.99083339 30.37381981 ZT8-11 25.7410394875 25.267502455 26.21457652 ZT12-15 16.50593268575 9.5488606165 23.463004755 ZT16-19 10.313625816 8.535560067 12.091691565 ZT20-23 16.6549257825 11.30696275 22.002888815