condition mean min max ZT0-3 14.5280483835 12.904298177000001 16.15179859 ZT4-7 7.5178324815 6.887963619500001 8.1477013435 ZT8-11 7.734952067 7.5667913125 7.9031128215 ZT12-15 5.72207823 5.323204505 6.120951955000001 ZT16-19 6.507379237 5.633408881 7.381349593 ZT20-23 14.030691037499999 11.994742685 16.06663939