condition mean min max ZT0-3 1.813401 1.1228829999999999 2.182855 ZT4-7 0.9912165 0.9912165 0.9912165 ZT8-11 3.049205 3.049205 3.049205 ZT12-15 5.47765 4.810404999999999 6.144895 ZT16-19 4.569 4.569 4.569 ZT20-23 3.8890200000000004 3.8890200000000004 3.8890200000000004