condition mean min max ZT0-3 0.7224080832499999 0.536050256 0.9087659104999999 ZT4-7 0.9696703287499999 0.853564814 1.0857758435 ZT8-11 1.1825172665 1.1115273005000001 1.2535072325 ZT12-15 1.2983392712500001 1.1875481565000001 1.4091303860000002 ZT16-19 1.28594104375 1.2406935445 1.3311885430000001 ZT20-23 1.95579353 1.8496282625 2.0619587975