condition mean min max ZT0-3 1.674185 1.674185 1.674185 ZT4-7 1.2859805 1.2859805 1.2859805 ZT8-11 2.04493 2.04493 2.04493 ZT12-15 3.2485 3.2485 3.2485 ZT16-19 2.5346 2.5346 2.5346 ZT20-23 2.1660500000000003 2.1660500000000003 2.1660500000000003