condition mean min max ZT0-3 51.41271666666667 44.67035 56.09725 ZT4-7 42.36895 42.36895 42.36895 ZT8-11 50.79205 50.79205 50.79205 ZT12-15 61.9608 60.49905 63.42255 ZT16-19 51.404300000000006 51.404300000000006 51.404300000000006 ZT20-23 59.670500000000004 59.670500000000004 59.670500000000004