condition mean min max ZT0-3 12.552900000000001 12.5314 12.5744 ZT4-7 14.209499999999998 14.209499999999998 14.209499999999998 ZT8-11 14.2165 14.2165 14.2165 ZT12-15 0 0 0 ZT16-19 16.76035 16.76035 16.76035 ZT20-23 14.56905 14.56905 14.56905