condition mean min max ZT0-3 2.1085828895 1.9088567200000002 2.308309059 ZT4-7 2.2357964795000003 2.0633533465 2.4082396125 ZT8-11 2.92504966375 2.771689437 3.0784098904999997 ZT12-15 1.6002438082500001 0.930357474 2.2701301425000002 ZT16-19 1.2372169729999998 0.6417570665000001 1.8326768794999997 ZT20-23 4.12665141 3.0811902985 5.1721125215