condition mean min max ZT0-3 175.7885 146.882 204.695 ZT4-7 47.995599999999996 47.995599999999996 47.995599999999996 ZT8-11 43.043 43.043 43.043 ZT12-15 0 0 0 ZT16-19 117.07050000000001 117.07050000000001 117.07050000000001 ZT20-23 136.5245 136.5245 136.5245