condition mean min max ZT0-3 0.919617 0.891846 0.9447875 ZT4-7 1.808615 1.808615 1.808615 ZT8-11 0.428103 0.428103 0.428103 ZT12-15 0.44746050000000004 0.2278385 0.6670825 ZT16-19 1.354955 1.354955 1.354955 ZT20-23 0.9187955000000001 0.9187955000000001 0.9187955000000001