condition mean min max ZT0-3 557.435229 557.435229 557.435229 ZT4-7 702.7790070000001 702.7790070000001 702.7790070000001 ZT8-11 683.5341175 683.5341175 683.5341175 ZT12-15 556.3247085 556.3247085 556.3247085 ZT16-19 608.1315635000001 608.1315635000001 608.1315635000001 ZT20-23 626.956736 626.956736 626.956736