condition mean min max ZT0-3 18.0131 17.5148 18.511400000000002 ZT4-7 8.17163 8.17163 8.17163 ZT8-11 5.664045 5.664045 5.664045 ZT12-15 0 0 0 ZT16-19 16.177799999999998 16.177799999999998 16.177799999999998 ZT20-23 16.5198 16.5198 16.5198