condition mean min max ZT0-3 51.785508333333325 13.274275 72.8945 ZT4-7 14.195599999999999 14.195599999999999 14.195599999999999 ZT8-11 31.94095 31.94095 31.94095 ZT12-15 16.803449999999998 15.9011 17.7058 ZT16-19 45.2328 45.2328 45.2328 ZT20-23 63.028549999999996 63.028549999999996 63.028549999999996