condition mean min max ZT0-3 5.7439325 4.216645 7.2712200000000005 ZT4-7 3.472085 3.472085 3.472085 ZT8-11 0.6339440000000001 0.6339440000000001 0.6339440000000001 ZT12-15 0 0 0 ZT16-19 2.4850950000000003 2.4850950000000003 2.4850950000000003 ZT20-23 1.7199200000000001 1.7199200000000001 1.7199200000000001