condition mean min max ZT0-3 2.6676075 2.1420649999999997 3.19315 ZT4-7 4.528905 4.528905 4.528905 ZT8-11 15.97825 15.97825 15.97825 ZT12-15 0 0 0 ZT16-19 2.74421 2.74421 2.74421 ZT20-23 1.4073605 1.4073605 1.4073605