condition mean min max ZT0-3 3.7466475 3.644675 3.8486200000000004 ZT4-7 4.540075 4.540075 4.540075 ZT8-11 4.450755 4.450755 4.450755 ZT12-15 0 0 0 ZT16-19 7.1375399999999996 7.1375399999999996 7.1375399999999996 ZT20-23 6.1571549999999995 6.1571549999999995 6.1571549999999995