condition mean min max ZT0-3 49.5772345525 43.699205495 55.45526361 ZT4-7 31.778040230000002 31.089992325 32.466088135 ZT8-11 20.34036374075 15.559694246500001 25.121033235 ZT12-15 10.411457004750002 7.8925052635 12.930408746000001 ZT16-19 6.006742385 4.8933708665 7.1201139035 ZT20-23 3.232503666 3.227224873 3.237782459