condition mean min max ZT0-3 73.223933 73.223933 73.223933 ZT4-7 98.350326 98.350326 98.350326 ZT8-11 111.8432475 111.8432475 111.8432475 ZT12-15 109.24007399999999 109.24007399999999 109.24007399999999 ZT16-19 117.77753150000001 117.77753150000001 117.77753150000001 ZT20-23 106.406884 106.406884 106.406884