condition mean min max ZT0-3 0.32397893775000003 0.140657271 0.5073006045 ZT4-7 2.6872215085000004 1.5923357125000002 3.7821073045 ZT8-11 7.75318172025 6.5300050270000005 8.9763584135 ZT12-15 7.558407116000001 6.930191184 8.186623048000001 ZT16-19 5.678422379250001 5.5782883425000005 5.778556416000001 ZT20-23 7.47800106725 6.588677124 8.3673250105