condition mean min max ZT0-3 2.9046950000000002 2.9046950000000002 2.9046950000000002 ZT4-7 6.227295 6.227295 6.227295 ZT8-11 2.848735 2.848735 2.848735 ZT12-15 1.381871 1.381871 1.381871 ZT16-19 0.5307040000000001 0.5307040000000001 0.5307040000000001 ZT20-23 0.8242875000000001 0.8242875000000001 0.8242875000000001