condition mean min max ZT0-3 2.2526625 2.146955 2.35837 ZT4-7 2.70829 2.70829 2.70829 ZT8-11 2.947375 2.947375 2.947375 ZT12-15 0 0 0 ZT16-19 5.44692 5.44692 5.44692 ZT20-23 3.20427 3.20427 3.20427