condition mean min max ZT0-3 5.9887084745 5.750378557 6.227038392 ZT4-7 4.45632552 4.0468884195 4.8657626205 ZT8-11 9.621006771 7.065481956999999 12.176531585 ZT12-15 10.627612188750001 10.302604654500001 10.952619723000002 ZT16-19 3.4938271085 3.0947692865 3.8928849305 ZT20-23 2.87430264325 2.818867514 2.9297377725