condition mean min max ZT0-3 8.948263 8.948263 8.948263 ZT4-7 12.1470275 12.1470275 12.1470275 ZT8-11 10.373248499999999 10.373248499999999 10.373248499999999 ZT12-15 10.362793499999999 10.362793499999999 10.362793499999999 ZT16-19 11.2073715 11.2073715 11.2073715 ZT20-23 11.521695 11.521695 11.521695