condition mean min max ZT0-3 0.2917596415 0.0 0.583519283 ZT4-7 2.1341623272500003 1.137425945 3.1308987095000003 ZT8-11 4.84689854 3.5450150975000003 6.1487819825 ZT12-15 4.4517400345 3.8992746865 5.0042053825 ZT16-19 2.2870618352500003 1.8682843224999999 2.7058393480000005 ZT20-23 0.5853242147500001 0.4303894045 0.7402590250000001