condition mean min max ZT0-3 39.088748047500005 39.02901165 39.148484445 ZT4-7 14.773140885 12.240875214999999 17.305406555 ZT8-11 13.4076373475 10.426026985 16.38924771 ZT12-15 16.451834165 16.218851524999998 16.684816805 ZT16-19 22.2891241225 21.899254105 22.67899414 ZT20-23 24.845621847500002 24.100616860000002 25.590626835000002