condition mean min max ZT0-3 2020.4758540000003 1800.871336 2240.0803720000004 ZT4-7 1990.9190185000002 1912.4869865 2069.3510505000004 ZT8-11 1216.26809705 994.01541155 1438.5207825500001 ZT12-15 379.34606002500004 334.74083425000003 423.9512858 ZT16-19 721.0858177499999 507.11582235 935.05581315 ZT20-23 1229.46775955 1094.9059791 1364.02954