condition mean min max ZT0-3 3.8332867452499997 2.5127653309999998 5.1538081595 ZT4-7 11.7937967645 8.427750394 15.159843135 ZT8-11 15.677313705000001 14.823851565000002 16.530775845 ZT12-15 19.704807 18.85936675 20.550247249999998 ZT16-19 23.72889247 20.864157640000002 26.5936273 ZT20-23 44.44452889 38.753811195 50.135246585000004